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WPF Override control background property

I'm kind of new to WPF and I'm not really sure how the whole thing works. I have three buttons below, which I would like to be individually coloured. I also want them to be transparent and have grey text when they are disabled.
I want them to retain the Background colour property assigned in MainWindow.xaml when they are enabled and be transparent when disabled.
I'm not sure how I would go about this. Does it involve templates, styles, binding converters? Any help would be greatly appreciated.
MainWindow.xaml
<Button Grid.Column="0" Content="Suspend" Style="{StaticResource BubbleButton}" IsEnabled="True" Background="Blue"/>
<Button Grid.Column="1" Content="Training Mode" Style="{StaticResource BubbleButton}" IsEnabled="True" Background="Orange"/>
<Button Grid.Column="2" Content="Exit Program" Style="{StaticResource BubbleButton}" Background="Red"/>
App.xaml
<Style x:Key="BubbleButton" TargetType="{x:Type Button}">
<!-- Triggers -->
<Style.Triggers>
<Trigger Property="IsEnabled" Value="False">
<Trigger.Setters>
<Setter Property="Background" Value="Transparent"/>
<Setter Property="Foreground" Value="Gray"/>
</Trigger.Setters>
</Trigger>
</Style.Triggers>
<!-- Style -->
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type Button}">
<Border CornerRadius="10" Background="{TemplateBinding Background}" Name="Button" Margin="10,5,10,5">
<Grid>
<Border BorderThickness="1,0,1,1" BorderBrush="Black" CornerRadius="{Binding ElementName=Button, Path=CornerRadius}">
<Border.Effect>
<BlurEffect Radius="2" KernelType="Gaussian"/>
</Border.Effect>
</Border>
<Border BorderThickness="0,1,0,0" BorderBrush="White" Margin="2" Opacity="0.7" CornerRadius="{Binding ElementName=Button, Path=CornerRadius}">
<Border.Effect>
<BlurEffect Radius="2" KernelType="Gaussian"/>
</Border.Effect>
</Border>
<TextBlock TextWrapping="WrapWithOverflow" Text="{TemplateBinding Content}" FontWeight="Medium" HorizontalAlignment="Center" VerticalAlignment="Center"/>
</Grid>
</Border>
</ControlTemplate>
</Setter.Value>
</Setter>
<Setter Property="Foreground" Value="Gray" />
<Setter Property="FontSize" Value="20" />
</Style>
Enabled:
Disabled:

using ControlTemplate.Triggers and adding TargetName should make it work. do the same for TextBlock and Foreground (from what I see, the Setter in Style, not in Trigger should be White).
<ControlTemplate.Triggers>
<Trigger Property="IsEnabled" Value="False">
<Setter TargetName="Button" Property="Background" Value="Transparent"/>
</Trigger>
</ControlTemplate.Triggers>

How can I edit the default navigation style

This is my first application with a GUI that I'm building so I might be doing things wrong.
I want to implement some navigation into my app but I don't seem to understand how to do it properly.
Here's the code:
.xaml
<Window x:Class="introducereDAC.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
mc:Ignorable="d"
Title="Divide et Impera" Height="450" Width="800" Background="#FF00000F">
<Grid>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="1*"></ColumnDefinition>
<ColumnDefinition Width="1*"></ColumnDefinition>
<ColumnDefinition Width="1*"></ColumnDefinition>
<ColumnDefinition Width="1*"></ColumnDefinition>
<ColumnDefinition Width="1*"></ColumnDefinition>
<ColumnDefinition Width="1*"></ColumnDefinition>
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height="0.5*"></RowDefinition>
<RowDefinition Height="1*"></RowDefinition>
<RowDefinition Height="1*"></RowDefinition>
<RowDefinition Height="5*"></RowDefinition>
</Grid.RowDefinitions>
<TextBlock Grid.Column="0" Grid.Row="0" Grid.ColumnSpan="2" HorizontalAlignment="Left" VerticalAlignment="Center" TextWrapping="NoWrap" Text="
←Introducere DEI (curent)" FontFamily="./#Roboto Condensed" Foreground="#505054" Margin="45,0,0,0"/>
<Viewbox Stretch="Uniform" StretchDirection="Both" Grid.Column="0" HorizontalAlignment="Center" Grid.Row="1" VerticalAlignment="Top" Grid.ColumnSpan="2">
<Button Content="Introducere DEI" Width="200" Height="30" VerticalAlignment="Center" HorizontalAlignment="Center" FontFamily="./#Roboto Condensed" FontWeight="Bold" Margin="5,0">
<Button.Style>
<Style TargetType="{x:Type Button}">
<Setter Property="Background" Value="#00000f"/>
<Setter Property="Foreground" Value="#77dff1"/>
<Setter Property="BorderBrush" Value="#77dff1"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type Button}">
<Border Background="{TemplateBinding Background}" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}">
<ContentPresenter HorizontalAlignment="Center" VerticalAlignment="Center"/>
</Border>
</ControlTemplate>
</Setter.Value>
</Setter>
<Style.Triggers>
<Trigger Property="IsMouseOver" Value="True">
<Setter Property="Background" Value="#77dff1"/>
<Setter Property="Foreground" Value="#FFFFFF" />
<Setter Property="BorderBrush" Value="#77dff1"/>
</Trigger>
</Style.Triggers>
</Style>
</Button.Style>
</Button>
</Viewbox>
<Viewbox Stretch="Uniform" StretchDirection="Both" Grid.Column="2" HorizontalAlignment="Center" Grid.Row="1" VerticalAlignment="Top" Grid.ColumnSpan="2">
<Button Content="DEI Iterativ" Width="200" Height="30" VerticalAlignment="Center" HorizontalAlignment="Center" FontFamily="./#Roboto Condensed" FontWeight="Bold" Margin="5,0">
<Button.Style>
<Style TargetType="{x:Type Button}">
<Setter Property="Background" Value="#00000f"/>
<Setter Property="Foreground" Value="#77dff1"/>
<Setter Property="BorderBrush" Value="#77dff1"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type Button}">
<Border Background="{TemplateBinding Background}" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}">
<ContentPresenter HorizontalAlignment="Center" VerticalAlignment="Center"/>
</Border>
</ControlTemplate>
</Setter.Value>
</Setter>
<Style.Triggers>
<Trigger Property="IsMouseOver" Value="True">
<Setter Property="Background" Value="#77dff1"/>
<Setter Property="Foreground" Value="#FFFFFF" />
<Setter Property="BorderBrush" Value="#77dff1"/>
</Trigger>
</Style.Triggers>
</Style>
</Button.Style>
</Button>
</Viewbox>
<Viewbox Stretch="Uniform" StretchDirection="Both" Grid.Column="4" HorizontalAlignment="Center" Grid.Row="1" VerticalAlignment="Top" Grid.ColumnSpan="2">
<Button Content="Probleme DEI" Width="200" Height="30" VerticalAlignment="Center" HorizontalAlignment="Center" FontFamily="./#Roboto Condensed" FontWeight="Bold" Margin="5,0" Click="NavigareProbleme">
<Button.Style>
<Style TargetType="{x:Type Button}">
<Setter Property="Background" Value="#00000f"/>
<Setter Property="Foreground" Value="#77dff1"/>
<Setter Property="BorderBrush" Value="#77dff1"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type Button}">
<Border Background="{TemplateBinding Background}" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}">
<ContentPresenter HorizontalAlignment="Center" VerticalAlignment="Center"/>
</Border>
</ControlTemplate>
</Setter.Value>
</Setter>
<Style.Triggers>
<Trigger Property="IsMouseOver" Value="True">
<Setter Property="Background" Value="#77dff1"/>
<Setter Property="Foreground" Value="#FFFFFF" />
<Setter Property="BorderBrush" Value="#77dff1"/>
</Trigger>
</Style.Triggers>
</Style>
</Button.Style>
</Button>
</Viewbox>
<Viewbox Stretch="Uniform" StretchDirection="Both" Grid.Column="0" HorizontalAlignment="Center" Grid.Row="2" VerticalAlignment="Top">
<Button Content="Teorie" Width="200" Height="30" VerticalAlignment="Center" HorizontalAlignment="Center" FontFamily="./#Roboto Condensed" FontWeight="Bold" Margin="10,0">
<Button.Style>
<Style TargetType="{x:Type Button}">
<Setter Property="Background" Value="#00000f"/>
<Setter Property="Foreground" Value="#77dff1"/>
<Setter Property="BorderBrush" Value="#77dff1"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type Button}">
<Border Background="{TemplateBinding Background}" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}">
<ContentPresenter HorizontalAlignment="Center" VerticalAlignment="Center"/>
</Border>
</ControlTemplate>
</Setter.Value>
</Setter>
<Style.Triggers>
<Trigger Property="IsMouseOver" Value="True">
<Setter Property="Background" Value="#77dff1"/>
<Setter Property="Foreground" Value="#FFFFFF" />
<Setter Property="BorderBrush" Value="#77dff1"/>
</Trigger>
</Style.Triggers>
</Style>
</Button.Style>
</Button>
</Viewbox>
<Viewbox Stretch="Uniform" StretchDirection="Both" Grid.Column="1" HorizontalAlignment="Center" Grid.Row="2" VerticalAlignment="Top">
<Button Content="Avantaje + Dezavantaje" Width="200" Height="30" VerticalAlignment="Center" HorizontalAlignment="Center" FontFamily="./#Roboto Condensed" FontWeight="Bold" Margin="10,0">
<Button.Style>
<Style TargetType="{x:Type Button}">
<Setter Property="Background" Value="#00000f"/>
<Setter Property="Foreground" Value="#77dff1"/>
<Setter Property="BorderBrush" Value="#77dff1"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type Button}">
<Border Background="{TemplateBinding Background}" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}">
<ContentPresenter HorizontalAlignment="Center" VerticalAlignment="Center"/>
</Border>
</ControlTemplate>
</Setter.Value>
</Setter>
<Style.Triggers>
<Trigger Property="IsMouseOver" Value="True">
<Setter Property="Background" Value="#77dff1"/>
<Setter Property="Foreground" Value="#FFFFFF" />
<Setter Property="BorderBrush" Value="#77dff1"/>
</Trigger>
</Style.Triggers>
</Style>
</Button.Style>
</Button>
</Viewbox>
<Viewbox Stretch="Uniform" StretchDirection="Both" Grid.Column="2" HorizontalAlignment="Center" Grid.Row="2" VerticalAlignment="Top">
<Button Content="Comparatii cu alte metode" Width="200" Height="30" VerticalAlignment="Center" HorizontalAlignment="Center" FontFamily="./#Roboto Condensed" FontWeight="Bold" Margin="10,0">
<Button.Style>
<Style TargetType="{x:Type Button}">
<Setter Property="Background" Value="#00000f"/>
<Setter Property="Foreground" Value="#77dff1"/>
<Setter Property="BorderBrush" Value="#77dff1"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type Button}">
<Border Background="{TemplateBinding Background}" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}">
<ContentPresenter HorizontalAlignment="Center" VerticalAlignment="Center"/>
</Border>
</ControlTemplate>
</Setter.Value>
</Setter>
<Style.Triggers>
<Trigger Property="IsMouseOver" Value="True">
<Setter Property="Background" Value="#77dff1"/>
<Setter Property="Foreground" Value="#FFFFFF" />
<Setter Property="BorderBrush" Value="#77dff1"/>
</Trigger>
</Style.Triggers>
</Style>
</Button.Style>
</Button>
</Viewbox>
<Viewbox Stretch="Uniform" StretchDirection="Both" Grid.Column="3" HorizontalAlignment="Center" Grid.Row="2" VerticalAlignment="Top">
<Button Content="Cod" Width="200" Height="30" VerticalAlignment="Center" HorizontalAlignment="Center" FontFamily="./#Roboto Condensed" FontWeight="Bold" Margin="10,0">
<Button.Style>
<Style TargetType="{x:Type Button}">
<Setter Property="Background" Value="#00000f"/>
<Setter Property="Foreground" Value="#77dff1"/>
<Setter Property="BorderBrush" Value="#77dff1"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type Button}">
<Border Background="{TemplateBinding Background}" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}">
<ContentPresenter HorizontalAlignment="Center" VerticalAlignment="Center"/>
</Border>
</ControlTemplate>
</Setter.Value>
</Setter>
<Style.Triggers>
<Trigger Property="IsMouseOver" Value="True">
<Setter Property="Background" Value="#77dff1"/>
<Setter Property="Foreground" Value="#FFFFFF" />
<Setter Property="BorderBrush" Value="#77dff1"/>
</Trigger>
</Style.Triggers>
</Style>
</Button.Style>
</Button>
</Viewbox>
<Viewbox Stretch="Uniform" StretchDirection="Both" Grid.Column="4" HorizontalAlignment="Center" Grid.Row="2" VerticalAlignment="Top">
<Button Content="Complexitate" Width="200" Height="30" VerticalAlignment="Center" HorizontalAlignment="Center" FontFamily="./#Roboto Condensed" FontWeight="Bold" Margin="10,0">
<Button.Style>
<Style TargetType="{x:Type Button}">
<Setter Property="Background" Value="#00000f"/>
<Setter Property="Foreground" Value="#77dff1"/>
<Setter Property="BorderBrush" Value="#77dff1"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type Button}">
<Border Background="{TemplateBinding Background}" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}">
<ContentPresenter HorizontalAlignment="Center" VerticalAlignment="Center"/>
</Border>
</ControlTemplate>
</Setter.Value>
</Setter>
<Style.Triggers>
<Trigger Property="IsMouseOver" Value="True">
<Setter Property="Background" Value="#77dff1"/>
<Setter Property="Foreground" Value="#FFFFFF" />
<Setter Property="BorderBrush" Value="#77dff1"/>
</Trigger>
</Style.Triggers>
</Style>
</Button.Style>
</Button>
</Viewbox>
<Viewbox Stretch="Uniform" StretchDirection="Both" Grid.Column="5" HorizontalAlignment="Center" Grid.Row="2" VerticalAlignment="Top">
<Button Content="Executie" Width="200" Height="30" VerticalAlignment="Center" HorizontalAlignment="Center" FontFamily="./#Roboto Condensed" FontWeight="Bold" Margin="10,0">
<Button.Style>
<Style TargetType="{x:Type Button}">
<Setter Property="Background" Value="#00000f"/>
<Setter Property="Foreground" Value="#77dff1"/>
<Setter Property="BorderBrush" Value="#77dff1"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type Button}">
<Border Background="{TemplateBinding Background}" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}">
<ContentPresenter HorizontalAlignment="Center" VerticalAlignment="Center"/>
</Border>
</ControlTemplate>
</Setter.Value>
</Setter>
<Style.Triggers>
<Trigger Property="IsMouseOver" Value="True">
<Setter Property="Background" Value="#77dff1"/>
<Setter Property="Foreground" Value="#FFFFFF" />
<Setter Property="BorderBrush" Value="#77dff1"/>
</Trigger>
</Style.Triggers>
</Style>
</Button.Style>
</Button>
</Viewbox>
<DockPanel Grid.Row="3" Grid.ColumnSpan="6">
<Frame x:Name="_mainFrame" />
</DockPanel>
</Grid>
</Window>
.xaml.cs
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Data;
using System.Windows.Documents;
using System.Windows.Input;
using System.Windows.Media;
using System.Windows.Media.Imaging;
using System.Windows.Navigation;
using System.Windows.Shapes;
namespace introducereDAC
{
/// <summary>
/// Interaction logic for MainWindow.xaml
/// </summary>
public partial class MainWindow : Window
{
public MainWindow()
{
InitializeComponent();
}
private void NavigareProbleme(object sender, RoutedEventArgs e)
{
_mainFrame.Navigate(new Page1());
}
}
}
As an experiment, I've been trying to do it on the button "Probleme DEI", using Click="NavigareProbleme".
After I double click on the button, my app looks like this:
My goal is to edit that white bar and its buttons however I want, but I don't know how to do it (and I didn't find anything useful on Google), and move it at the top, above the other buttons.
Also, is there any way to make it always be there? (not only after I double click on "Probleme DEI")
Thanks.

I don't recommend to use a Frame. Instead implement a simple custom page/view navigation using data templates. You can follow this examples, if you are interested: C# WPF Page Navigation Class, How do I toggle between pages in a WPF application?.
Do not wrap each control you want to display.
Using a Viewbox to wrap a Button does not make sense. A Button inside a Grid will always stretch to occupy all available space by default. Use a Viewbox to stretch and scale elements that don't have their own resize behavior implemented and require on absolute layout properties, like Path. I doubt that you really want you buttons to stretch freely as this would look very odd.
Wrapping the lonely Frame into a DockPanel also does not make any sense. A DockPanel is a container, that arranges it's child elements relative to each other. It only makes sense to use it with more than a single child. Just add the Frame directly to the Grid. Every redundant Panel and UIElement will cost a unnecessary performance penalty as they have to be measured, arranged and maybe rendered individually (recursively).
Create a style for a control (WPF .NET) - Do not copy and paste styles to reuse them. Define a single Style, assign it a x:Key and add it to a ResourceDictionary e.g, App.xaml. Then reference it using the StaticResource markup (or define the Style as implicit to make it apply to all buttons implicitly):
App.xaml
<ResourceDictionary>
<Style x:Key="ButtonStyle" TargetType="{x:Type Button}">
<Setter Property="Background" Value="#00000f"/>
<Setter Property="Foreground" Value="#77dff1"/>
...
</Style>
</ResourceDictionary>
Then reference it using StaticResource and the defined key:
<Button Style="{StaticResource ButtonStyle}" />
To customize the navigation bar of the Frame you would have to override the default template. You can visit Frame Styles and Templates to find an example of the original Frame style.
Alternatively hide the original navigation bar (by setting Frame.NavigationUIVisibility) and implement a custom one and use the frame's NavigationService to navigate between its content.
Moving the navigation bar without moving the Frame is not possible. Taking a look at the default template will show you that it is part of the Frame control. You can only move the buttons into a the Page, to make them part of the frame's content.
At this point I have to recommend to implement a custom navigation logic again. It will give you all the flexibility to layout your view you want, as navigation buttons and the actual content host are not part of the same template.
Or hide the original navigation UI and implement your own and locate it where ever you want.

How to underline textblock which is a child of a button when button is hovered

I have the following style
<Style x:Key="RoundedBtn" TargetType="{x:Type Button}">
<Setter Property="Background" Value="White"/>
<Setter Property="BorderThickness" Value="1"/>
<Setter Property="BorderBrush" Value="{x:Null}"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type Button}">
<Border x:Name="button" CornerRadius="5" Background="{TemplateBinding Background}" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}">
<Grid>
<Image x:Name="image" Source="{Binding ButtonImage, RelativeSource={RelativeSource AncestorType=Button}}" Margin="0,2,0,3" HorizontalAlignment="Left" Width="40" />
<Border BorderBrush="{x:Null}" Height="16" Margin="45,15,0,14" Width="123" HorizontalAlignment="Left">
<TextBlock x:Name="textBlock" Margin="-1" TextWrapping="Wrap" Text="{Binding ButtonText, RelativeSource={RelativeSource AncestorType=Button} }"
FontSize="13"
FontFamily="{DynamicResource Helvetica}" VerticalAlignment="Center" TextDecorations="{x:Null}">
</TextBlock>
</Border>
</Grid>
</Border>
<ControlTemplate.Triggers>
<Trigger Property="IsMouseOver" Value="True">
<Setter Property="BorderBrush" Value="#8da0aa"></Setter>
<Setter Property="Foreground" Value="#318EE4"></Setter>
<Setter TargetName="textBlock" Property="TextBlock.TextDecorations" Value="Underline">
<!--That Text decoration part doesnt work--></Setter>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
I apply this style to my "usercontrol" (which is actually a button):
<Button x:Name="btn" x:Class="MyStock.MyButton"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
mc:Ignorable="d" Height="45" Width="183" Style="{DynamicResource RoundedBtn}" />
When I generate the project, the "MyButton" appears in my custom controls. But if I drag it on my form and test it, the Text Underline doesnt work.
But If i put a normal button on my form and then apply the RoundedBtn style, it works, why ?
By the way, what I am trying to achieve is to have a button that looks like the left menu buttons on this page

Use TargetName in the Setter:
<ControlTemplate.Triggers>
<Trigger Property="IsMouseOver" Value="True" >
<Setter TargetName="textBlock" Property="TextBlock.TextDecorations" Value="Underline" />
</Trigger>
</ControlTemplate.Triggers>
The whole style looks like this (I remove irrelevant part for readability)
<Style x:Key="RoundedBtn" TargetType="{x:Type Button}">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type Button}">
<Border x:Name="button">
<Grid>
<Border>
<TextBlock x:Name="textBlock" Margin="-1" TextWrapping="Wrap" Text="ABC"
FontSize="13" TextDecorations="{x:Null}">
</TextBlock>
</Border>
</Grid>
</Border>
<ControlTemplate.Triggers>
<Trigger Property="IsMouseOver" Value="True" >
<Setter TargetName="textBlock" Property="TextBlock.TextDecorations" Value="Underline" />
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>

Wpf textbox does not change borderbrush when trigger mouse over?

In my WPF application I want to to change borderbrush color for a TextBox when mouse enter, but it does not change color to the one I want, but it change to sky blue (I guess it is standard color).
Here is my XAML code:
<Window x:Class="OnePlayApp.Views.LoginDialog"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
xmlns:local="clr-namespace:OnePlayApp.Views"
WindowStyle="None"
ResizeMode="NoResize"
Title="LoginDialog" Height="350" Width="550" Foreground="Black">
<Grid Background="#282828">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="24*"/>
<ColumnDefinition Width="43*"/>
<ColumnDefinition Width="43*"/>
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height="59*"/>
<RowDefinition Height="50*"/>
<RowDefinition Height="50*"/>
<RowDefinition Height="191*"/>
</Grid.RowDefinitions>
<Image Margin="9,10,173,6" Source="/Resources/logo.png" Grid.ColumnSpan="2"/>
<Label x:Name="AccountName" Content="Account name" Margin="6,10,1,13" Foreground="#FFAFADAD" HorizontalContentAlignment="Right" Grid.Row="1"/>
<Label x:Name="Password" Content="Password
" Margin="6,10,1,13" Foreground="#FFAFADAD" HorizontalContentAlignment="Right" Grid.Row="2"/>
<TextBox x:Name="username" Margin="6,11,15,8" Background="#FF282828" Foreground="White" FontSize="15" Text="Ahsep12015#one.com" FontFamily="Yu Gothic UI Semibold" Grid.Column="1" Grid.Row="1" Grid.ColumnSpan="2" VerticalContentAlignment="Center" BorderThickness="10">
<TextBox.Style>
<Style TargetType="{x:Type TextBox}">
<Setter Property="BorderBrush" Value="Green" />
<Style.Triggers>
<Trigger Property="IsMouseOver" Value="True">
<Setter Property="BorderBrush" Value="Red" />
</Trigger>
</Style.Triggers>
</Style>
</TextBox.Style>
</TextBox>
<PasswordBox x:Name="password" Margin="6,8,15,13" Background="#FF282828" Password="123456789" FontSize="18" Grid.Column="1" Grid.Row="2" Grid.ColumnSpan="2"/>
<Button x:Name="LoginBtn" Content="Login" Margin="6,15,15,146" Click="LoginBtn_Click" FontSize="16" FontFamily="Yu Gothic UI Semibold" Foreground="White" Grid.Column="1" Grid.Row="3">
<Button.Style>
<Style TargetType="{x:Type Button}">
<Setter Property="Background" Value="#FFAFADAD"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type Button}">
<Border Background="{TemplateBinding Background}">
<ContentPresenter HorizontalAlignment="Center" VerticalAlignment="Center"/>
</Border>
</ControlTemplate>
</Setter.Value>
</Setter>
<Style.Triggers>
<Trigger Property="IsMouseOver" Value="True">
<Setter Property="Background" Value="#79B539"/>
</Trigger>
</Style.Triggers>
</Style>
</Button.Style>
</Button>
<Button x:Name="CancelBtn" Content="Cancel" Margin="6,15,15,146" Click="CancelBtn_Click" FontSize="16" FontFamily="Yu Gothic UI Semibold" Foreground="White" Grid.Column="2" Grid.Row="3">
<Button.Style>
<Style TargetType="{x:Type Button}">
<Setter Property="Background" Value="#FFAFADAD"/>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type Button}">
<Border Background="{TemplateBinding Background}">
<ContentPresenter HorizontalAlignment="Center" VerticalAlignment="Center"/>
</Border>
</ControlTemplate>
</Setter.Value>
</Setter>
<Style.Triggers>
<Trigger Property="IsMouseOver" Value="True">
<Setter Property="Background" Value="#79B539"/>
</Trigger>
</Style.Triggers>
</Style>
</Button.Style>
</Button>
</Grid>
</Window>

I had the same issue on Windows 8, and the only way I was able to fix this issue (which appears to be a bug in WPF) was with a ControlTemplate. This is the standard control template for a TextBox as coughed up by Blend. I changed the BorderBrush colors, added it to my global TextBox style, and it works great. There may be a better solution out there, but this is what works for me.
<Style TargetType="{x:Type TextBox}">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type TextBoxBase}">
<Border x:Name="border" BorderBrush="{TemplateBinding BorderBrush}" BorderThickness="{TemplateBinding BorderThickness}" Background="{TemplateBinding Background}" SnapsToDevicePixels="True">
<ScrollViewer x:Name="PART_ContentHost" Focusable="False" HorizontalScrollBarVisibility="Hidden" VerticalScrollBarVisibility="Hidden"/>
</Border>
<ControlTemplate.Triggers>
<Trigger Property="IsEnabled" Value="False">
<Setter Property="Opacity" TargetName="border" Value="0.56"/>
</Trigger>
<Trigger Property="IsMouseOver" Value="True">
<Setter Property="BorderBrush" TargetName="border" Value="Red"/>
</Trigger>
<Trigger Property="IsKeyboardFocused" Value="True">
<Setter Property="BorderBrush" TargetName="border" Value="Orange"/>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>

Changed button control template and now mouseover wont work

My button looks like this:
<Button ToolTip="Pending" Height="33" HorizontalAlignment="Right" Margin="0,5,379,0" Name="radButton2" VerticalAlignment="Top" Width="64" Background="#FF515151" BorderBrush="#FF515151" FontSize="14" Foreground="#FF5F5C5C" FontFamily="Mangal" Command="{Binding SetToPendingCommand}" IsEnabled="{Binding IsSetToPendingButtonEnabled}" Grid.Column="1" Grid.ColumnSpan="2">
<Button.Style>
<Style TargetType="{x:Type Button}">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate>
<Border BorderBrush="White" BorderThickness="1.5" CornerRadius="0">
<TextBlock Text="Pending" Foreground="White" TextAlignment="Center" FontSize="13" Margin="0,4, 0, 0" />
</Border>
</ControlTemplate>
</Setter.Value>
</Setter>
<Style.Triggers>
<Trigger Property="IsMouseOver" Value="True">
<Setter Property="Background" Value="Red"/>
</Trigger>
</Style.Triggers>
</Style>
</Button.Style>
</Button>
How do I get the mouseover to work correctly. I have tried not using a style and setting the template directly but that didnt't work either.

One way to do it is to move Triggers into ControlTemplate, give Border some name, for example x:Name="PART_Border", and then in the Setter you can specify TargetName="PART_Border":
<Button ...>
<Button.Style>
<Style TargetType="{x:Type Button}">
<Setter Property="Template">
<Setter.Value>
<ControlTemplate>
<Border BorderBrush="White" BorderThickness="1.5" CornerRadius="0" x:Name="PART_Border">
<TextBlock Text="Pending" Foreground="White" TextAlignment="Center" FontSize="13" Margin="0,4, 0, 0" />
</Border>
<ControlTemplate.Triggers>
<Trigger Property="IsMouseOver" Value="True">
<Setter Property="Background" Value="Red" TargetName="PART_Border"/>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</Button.Style>
</Button>

Move the trigger to ControlTemplate instead:
<ControlTemplate>
<Border BorderThickness="1.5" CornerRadius="0">
<TextBlock x:Name="txtBlock" Text="Pending" Foreground="White"
TextAlignment="Center" FontSize="13" Margin="0,4,0,0" />
</Border>
<ControlTemplate.Triggers>
<Trigger Property="IsMouseOver" Value="True">
<Setter TargetName="txtBlock" Property="Background" Value="Red"/>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>

All you need to do is add a template binding to the background property of the Border:
<Border Background="{TemplateBinding Background}" BorderBrush="White" BorderThickness="1.5" CornerRadius="0">
<TextBlock Text="Pending" Foreground="White" TextAlignment="Center" FontSize="13" Margin="0,4, 0, 0" />
</Border>
The important part is:
Background="{TemplateBinding Background}"
As it stands in the question the trigger is changing the template Background property, but that property is not being used within the control template.