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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 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>

Bind ControlTemplateTrigger to TextBlock property

I am trying to change the TextBlock text colour whenever the Button is highlighted.
However, I don't know how to bind the ControlTemplate.Trigger to the TextBlock Foreground. I tried giving the TextBlock a Name and then using TargetName in Setter but it said that the name wasn't recognised.
<Button Name="Home" HorizontalAlignment="Left" Width="75" Click="Button_Click_Home" Background="#FF252525" BorderThickness="5">
<Button.Content>
<Grid HorizontalAlignment="Center" VerticalAlignment="Bottom">
<TextBlock FontFamily="/VideoManager;component/#Myriad Pro" FontSize="13.333" Foreground="White" Text="Home"></TextBlock>
</Grid>
</Button.Content>
<Button.Template>
<ControlTemplate TargetType="{x:Type Button}">
<ContentPresenter />
<ControlTemplate.Triggers>
<Trigger Property="IsMouseOver" Value="True">
<Setter Property="Foreground" Value="#FF360A0A" /> // What to put here..
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Button.Template>

this is going to help you, but it has a lot of loss, so i suggest to you to read more about Styles And Templates
<Button Name="Home" HorizontalAlignment="Left" Width="75" Background="#FF252525" BorderThickness="5">
<Button.Content>
<Grid HorizontalAlignment="Center" VerticalAlignment="Bottom">
<TextBlock FontFamily="/VideoManager;component/#Myriad Pro" FontSize="13.333" Text="Home"></TextBlock>
</Grid>
</Button.Content>
<Button.Template>
<ControlTemplate TargetType="{x:Type Button}">
<Border Background="{TemplateBinding Background}">
<ContentPresenter />
</Border>
<ControlTemplate.Triggers>
<Trigger Property="IsMouseOver" Value="True">
<Setter Property="Foreground" Value="Yellow" />
<Setter Property="Background" Value="Red" />
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Button.Template>
</Button>

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.