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Modifications of the window control buttons (hide, close and maximize) with Avalonia in C#

I want to change the design of the buttons of the windows window and the rectangle that contains them: I would like the rectangle to be filled by my background, and to be able to change the design of the buttons
I want to remove the possibility for the user to change the size of the window, and to make it bigger, and I want to remove the Maximize button from the controls
I want to change the design of the hide button and the close button
And for the rectangle that contains the controls I would like it to be filled with my background, then I will add some pixels of thickness to the window in black to add contrast to the window
I tried different things proposed by the lib unfortunately nothing worked
Here is my code
MainWindow.axaml :
<Window xmlns="https://github.com/avaloniaui"
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" d:DesignWidth="800" d:DesignHeight="450"
x:Class="AvaloniaAppTest.MainWindow"
Height="600"
Width="900"
Icon="/assets/icon.ico"
Title="AppTest">
<Window.Background>
<ImageBrush Source="/assets/background.png"/>
</Window.Background>
<Grid>
<Grid.Background>
<ImageBrush Stretch="UniformToFill" Source="/assets/background.png"/>
</Grid.Background>
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*" />
<ColumnDefinition Width="*" />
</Grid.ColumnDefinitions>
<!-- Left Side -->
<StackPanel Grid.Column="0" HorizontalAlignment="Center" VerticalAlignment="Center">
<TextBlock Text="Left Click" FontWeight="Bold" FontSize="20" Foreground="White"/>
<Button x:Name="leftStart" Content="Start" Margin="5" Background="Yellow"/>
<Button x:Name="leftStop" Content="Stop" Margin="5" Background="Yellow"/>
<Button x:Name="leftHotkey" Content="Hotkey" Margin="5" Background="Yellow"/>
</StackPanel>
<!-- Right Side -->
<StackPanel Grid.Column="1" HorizontalAlignment="Center" VerticalAlignment="Center">
<TextBlock Text="Right Click" FontWeight="Bold" FontSize="20" Foreground="White"/>
<Button Content="Start" Margin="5" Background="Yellow"/>
<Button Content="Stop" Margin="5" Background="Yellow"/>
<Button Content="Hotkey" Margin="5" Background="Yellow"/>
</StackPanel>
</Grid>

How to make window transparent when using Frames and Pages?

I have a simple application I'm trying to make.
The idea is to start with a login screen and then move to an admin screen. For this, after looking for answers I stumbled upon Frames and Pages. The problem that I'm having now is that it seems that Pages are not compatible with translucency?
This is what I get when using Frame and Page:
This is what I want to replicate:
This is the main window with pages:
<Window
x:Class="Membership2.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"
xmlns:local="clr-namespace:Membership2"
mc:Ignorable="d"
Title="MainWindow" Height="768" Width="1366"
AllowsTransparency="True" WindowStyle="None" Background="Transparent"
WindowStartupLocation="CenterScreen">
<Grid>
<Frame x:Name="MainFrame" NavigationUIVisibility="Hidden"/>
</Grid>
</Window>
As you can see, Background property is set to Transparent, but it does nothing. I also tried setting the Grid Background and Frame Background to Transparent without success.
Also, WindowStartupLocation is set to CenterScreen when using Pages, but it also does nothing it seems.
EDIT:
So this problem arises when StartupUri (in App.xaml) is set to my LoginPage.xaml instead of the MainWindow.xaml (described previously).
This is my LoginPage.xaml:
<Page x:Class="Membership2.LoginPage"
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"
xmlns:local="clr-namespace:Membership2"
mc:Ignorable="d"
d:DesignHeight="550" d:DesignWidth="450"
MaxHeight="550" MaxWidth="450"
Title="LoginPage"
RenderOptions.ClearTypeHint="Enabled"
FontFamily="./Resources/Fonts/#Dosis"
xmlns:materialDesign="http://materialdesigninxaml.net/winfx/xaml/themes"
xmlns:fw="clr-namespace:SourceChord.FluentWPF;assembly=FluentWPF"
ShowsNavigationUI="False"
Background="Transparent"
>
<Grid
fw:PointerTracker.Enabled="True" Background="Transparent">
<Border
Background="WhiteSmoke"
CornerRadius="7"
Margin="30, 75, 30, 0">
</Border>
<Ellipse
Width="50"
Height="50"
Fill="WhiteSmoke"
Margin="0,-450,0,0">
</Ellipse>
<materialDesign:PackIcon
Kind="AccountCircle"
Width="150"
Height="150"
VerticalAlignment="Top"
HorizontalAlignment="Center"
Grid.RowSpan="2"
FontSize="50"
Foreground="#7ea4b3"
Grid.Column="1">
</materialDesign:PackIcon>
<Label
Content="Administración"
HorizontalAlignment="Center"
Margin="0,140,0,0"
FontSize="30"
FontFamily="./Resources/Fonts/#Dosis">
</Label>
<TextBox
x:Name="Username"
Width="230"
Height="45"
FontSize="25"
TextWrapping="NoWrap"
Style="{StaticResource MaterialDesignTextBox}"
FontWeight="Light"
RenderOptions.ClearTypeHint="Enabled"
FontFamily="./Resources/Fonts/#Dosis"
Margin="0, 0, 0, 50"
materialDesign:HintAssist.Hint="Usuario">
</TextBox>
<PasswordBox
x:Name="Password"
Width="230"
Height="45"
FontSize="25"
FontWeight="Light"
RenderOptions.ClearTypeHint="Enabled"
Margin="0, 150, 0, 0"
BorderThickness="0,0,0,1"
materialDesign:HintAssist.Hint="Contraseña"
materialDesign:TextFieldAssist.DecorationVisibility="Visible">
</PasswordBox>
<Button
x:Name="Login"
Width="150"
Height="48"
VerticalAlignment="Bottom"
Margin="0,0,0,70"
FontSize="25"
FontWeight="Light"
Background="LightGray"
Style="{StaticResource ButtonRevealStyle}"
BorderThickness="2,2,2,2">
Ingresar
</Button>
</Grid>
</Page>

Switch Pages In WPF using MahApps

First of all, thank you for taking your time to read this.
Im pretty new to WPF and especially to using MahApps - http://mahapps.com
Im having problems switching between pages that I have created using MahApps in my window.
Here is my starting window (MainWindow):
<Window
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:Controls="clr-namespace:MahApps.Metro.Controls;assembly=MahApps.Metro"
xmlns:Dialogs="clr-namespace:MahApps.Metro.Controls.Dialogs;assembly=MahApps.Metro" x:Class="WpfApplication.MainWindow"
xmlns:Dialog="clr-namespace:MahApps.Metro.Controls.Dialogs;assembly=MahApps.Metro"
Dialog:DialogParticipation.Register="{Binding}"
Title="MainWindow"
Height="600"
Width="800">
<Grid>
<Frame x:Name="Main"/>
</Grid>
Here is the page that I want to move to (I created a frame in the main so I could put the content of this page on it):
<Controls:MetroWindow
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:Controls="clr-namespace:MahApps.Metro.Controls;assembly=MahApps.Metro"
xmlns:Dialogs="clr-namespace:MahApps.Metro.Controls.Dialogs;assembly=MahApps.Metro" x:Class="WpfApplication.MainMenu"
xmlns:Dialog="clr-namespace:MahApps.Metro.Controls.Dialogs;assembly=MahApps.Metro"
Dialog:DialogParticipation.Register="{Binding}"
Title="MainMenu"
Height="600"
Width="800" NonActiveBorderBrush="#FFC32C2C">
<Grid>
<Image x:Name="Background" Source="C:\Users\User\Desktop\Iddo Work\C#Learning\WpfApplication/teaserBackground.jpg" Stretch="UniformToFill">
<Image.BitmapEffect>
<BlurBitmapEffect Radius="17" />
</Image.BitmapEffect>
</Image>
<Image x:Name="Logo" Source="C:\Users\User\Desktop\Iddo Work\C#Learning\WpfApplication/Trivia.png" Margin="0,60,0,320" VerticalAlignment="Center" HorizontalAlignment="Center"/>
<TextBox x:Name="Username" Controls:TextBoxHelper.Watermark=" USERNAME" Margin="0,308,0,226" Width="200" Height="35" TextAlignment="Justify" FontSize="20" FontWeight="Bold" HorizontalAlignment="Center" />
<TextBox x:Name="Password" Controls:TextBoxHelper.Watermark=" PASSWORD" Margin="0,378,0,156" Width="200" Height="35" TextAlignment="Justify" FontSize="20" FontWeight="Bold" />
<Button x:Name="SignIn" Content="" HorizontalAlignment="Left" Margin="407,435,0,0" VerticalAlignment="Top" Width="80" Style="{DynamicResource MetroCircleButtonStyle}" Height="80" BorderBrush="{x:Null}" Foreground="{x:Null}" Click="SignIn_Click">
<Button.Background>
<ImageBrush ImageSource="C:\Users\User\Desktop\Iddo Work\C#Learning\WpfApplication/signIn.png"/>
</Button.Background>
</Button>
<Button x:Name="SignUp" Content="" HorizontalAlignment="Left" Margin="310,435,0,0" VerticalAlignment="Top" Width="80" Style="{DynamicResource MetroCircleButtonStyle}" Height="80" BorderBrush="{x:Null}" Foreground="{x:Null}" Click="SignUp_Click">
<Button.Background>
<ImageBrush ImageSource="C:\Users\User\Desktop\Iddo Work\C#Learning\WpfApplication/sign-add-icon.png"/>
</Button.Background>
</Button>
</Grid>
Thank you in advance!

Updated answer:
Frames themselves are meant to load pages and your menu item is inheriting from a window so that will never work.
Here are the mods you need to make:
In your MainWindow.xaml change the Window tag to Controls:MetroWindow (like you have in your MainMenu xaml
In your MainWindow.xaml.cs remove the base class reference for the MainWindow (MainWindow : Window becomes just MainWindow)
In your MainMenu.xaml change Controls:MetroWindow to just UserControl
Back in your MainWindow.xaml, add a ref to your namespace xmlns:my="clr-namespace:WhateverHere"
In MainWindow.xaml, remove the and add your control directly instead
MainWindow.xaml
<Controls:MetroWindow x:Class="WPFDeleteMe.MainWindow"
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:Controls="clr-namespace:MahApps.Metro.Controls;assembly=MahApps.Metro"
xmlns:Dialogs="clr-namespace:MahApps.Metro.Controls.Dialogs;assembly=MahApps.Metro"
xmlns:Dialog="clr-namespace:MahApps.Metro.Controls.Dialogs;assembly=MahApps.Metro"
xmlns:my="clr-namespace:WPFDeleteMe"
Title="MainWindow" Height="700" Width="900">
<Grid x:Name="RootGrid">
<my:MainMenu></my:MainMenu>
</Grid>
</Controls:MetroWindow>
MainWindow.xaml.cs
public partial class MainWindow
{
public MainWindow()
{
InitializeComponent();
}
}
MainMenu.xaml
<UserControl x:Class="WPFDeleteMe.MainMenu"
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"
d:DesignHeight="600" d:DesignWidth="800">
<Grid>
<Image x:Name="Background" Source="d:\images\doll-161405_960_720.png" Stretch="UniformToFill">
<Image.BitmapEffect>
<BlurBitmapEffect Radius="17" />
</Image.BitmapEffect>
</Image>
<Image x:Name="Logo" Source="d:\images\Carestream_Solutions.gif" Margin="0,0,0,0" Width="150" Height="40" VerticalAlignment="Center" HorizontalAlignment="Center"/>
<Button x:Name="SignIn" Content="" HorizontalAlignment="Left" Margin="407,435,0,0" VerticalAlignment="Top" Width="80" Height="80" BorderBrush="{x:Null}" Foreground="{x:Null}" Click="SignIn_Click">
<Button.Background>
<ImageBrush ImageSource="d:\images\war_kitten.jpg"/>
</Button.Background>
</Button>
<Button x:Name="SignUp" Content="" HorizontalAlignment="Left" Margin="310,435,0,0" VerticalAlignment="Top" Width="80" Height="80" BorderBrush="{x:Null}" Foreground="{x:Null}" Click="SignUp_Click">
<Button.Background>
<ImageBrush ImageSource="d:\images\war_kitten.jpg"/>
</Button.Background>
</Button>
</Grid>
</UserControl>

Black area to the right, inside window

A large black area appears on the right side of the window when I run the program, and I can't figure out why. It's not there in the preview on the XAML file page in Visual Studio 2017, and I ran it once on a Windows 7 computer, and the black area wasn't there (I'm primarily on Windows 10). The problem could possibly be in another file, but I cannot find it.
<Window x:Class="Project.Widget"
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:Project"
mc:Ignorable="d"
Title="Menu"
WindowStartupLocation="Manual"
ResizeMode="NoResize"
Width="109"
SizeToContent="WidthAndHeight"
WindowState="Minimized"
Background="#2D3A48"
Topmost="False"
Loaded="Window_Loaded"
Closing="Window_Closing" >
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="77"/>
<RowDefinition Height="28"/>
<RowDefinition Height="90"/>
<RowDefinition Height="60"/>
</Grid.RowDefinitions>
<Image x:Name="Icon"
Source="./Resources/Icon.png"
HorizontalAlignment="Center"
VerticalAlignment="Top"
Height="77"
Width="109" />
<Label x:Name="labelUsername"
Grid.Row="1"
Content=""
FontSize="14"
Foreground="White"
HorizontalContentAlignment="Center"
VerticalContentAlignment="Center" />
<Label x:Name="labelScore"
Grid.Row="2"
Content="0%, 0 of 0"
Foreground="White"
FontSize="14"
HorizontalAlignment="Center"
VerticalAlignment="Top"
Margin="0,0,0,0" />
<Image x:Name="AvgScoreDot"
Grid.Row="2"
HorizontalAlignment="Center"
VerticalAlignment="Top"
Height="50"
Source=".\Resources\yellow_dot.png"
Margin="0,32,0,0"/>
<Label x:Name="labelAvgScore"
Grid.Row="2"
Content="0.0"
Foreground="White"
FontSize="24"
HorizontalAlignment="Center"
VerticalAlignment="Top"
Margin="0,35,0,0"
FontWeight="Bold" />
<Button x:Name="MailBtn"
Grid.Row="3"
Height="60"
Width="109"
HorizontalAlignment="Center"
VerticalAlignment="Center"
BorderBrush="#FF2D3A48"
Click="Mail_Click" >
<Button.Background>
<ImageBrush
ImageSource="/Resources/mail.png"
Stretch="None" />
</Button.Background>
</Button>
<Button x:Name="MailBadgeBtn"
Grid.Row="3"
Content="0"
Foreground="White"
FontSize="11"
HorizontalContentAlignment="Center"
VerticalContentAlignment="Center"
Height="20"
Width="20"
Margin="0,30,24,10"
HorizontalAlignment="Right"
VerticalAlignment="Center"
Click="MailBadgeBtn_Click" BorderThickness="0">
<Button.Background>
<ImageBrush
ImageSource=".\Resources\red_dot.png" />
</Button.Background>
</Button>
<TextBlock x:Name="labelConnection"
Grid.Row="0"
Text=" No Connection or blocked by Firewall"
Foreground="Red"
Background="White"
TextWrapping="Wrap"
TextAlignment="Center"
VerticalAlignment="Center"
Height="77"
Width="109"
HorizontalAlignment="Center" />
</Grid>
Here's an image of what I get when I run it:

Here's what I get when I remove SizeToContent="WidthAndHeight" and add a height of 300 (I also had to remove your event handlers since I don't have that code, and add garbage images to the Resources folder since I don't have the original images):
Is that more like what you were looking for? You can also choose to explicitly set SizeToContent to "Manual".

How to resize the user control in wpf at runtime

Am newbie to wpf development.In my wpf app i used user control.what i need is in runtime how can resize the user control,
Please help me to find solution,if my approach is wrong please guide me to get solution,
My XAML code is
<UserControl x:Class="test.pad"
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"
d:DesignHeight="300" d:DesignWidth="300" Focusable="True" OverridesDefaultStyle="False">
<Grid Width="102" Height="123" Name="Grid1" MouseMove="Grid1_MouseMove" MouseUp="Grid1_MouseUp" MouseDown="Grid1_MouseDown">
<Grid.RenderTransform>
<TranslateTransform x:Name="tt"/>
</Grid.RenderTransform>
<Border BorderBrush="Silver" BorderThickness="2">
<Canvas Height="120" HorizontalAlignment="Left" Margin="0,1,0,0" Name="canvas1" VerticalAlignment="Top" Width="100" Grid.ColumnSpan="2">
<RichTextBox Height="98" HorizontalAlignment="Left" Margin="0,24,0,0" Name="richTextBox1" VerticalAlignment="Top" Width="100" BorderThickness="2" Grid.ColumnSpan="2" Background="#FFFF96D8" Canvas.Top="-3" Canvas.Left="-1" />
<Button BorderBrush="#FFFF96D8" Canvas.Left="46" Canvas.Top="-2" Height="23" Name="close" Width="27">
</Button>
<Button Height="23" Name="minimise" Width="27" BorderBrush="#FFFF96D8" Click="button1_Click" Canvas.Left="72" Canvas.Top="-2" ClipToBounds="False" IsEnabled="True" IsHitTestVisible="True" OverridesDefaultStyle="False" ForceCursor="False" Foreground="Black" MouseMove="button1_MouseEnter" MouseLeave="button1_MouseLeave">
</Canvas>
</Border>
</Grid>
</UserControl>
thanks
ash

Remove the Height and Width of the UserControl and also the Grid.
Set the Margin or Size Property for UserControl where you call it.