SPT-AKI-Installer/SPTInstaller/CustomControls/TitleBar.axaml

<UserControl 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="SPTInstaller.CustomControls.TitleBar">

    <Grid ColumnDefinitions="AUTO,*,AUTO,AUTO">

        <Rectangle Grid.ColumnSpan="6" IsHitTestVisible="False"
                   Fill="{Binding Background, RelativeSource={
                      RelativeSource AncestorType=UserControl}}" />

        <Label Content="{Binding Title, RelativeSource={
			               RelativeSource AncestorType=UserControl}}"
               IsHitTestVisible="False"
               Foreground="{Binding Foreground, RelativeSource={
			                  RelativeSource AncestorType=UserControl}}"
               Background="Transparent"
               VerticalContentAlignment="Center" />

        <!-- Minimize (-) Button -->
        <Button Content="&#xE949;" Grid.Column="2"
                Foreground="{Binding ButtonForeground, RelativeSource={
												 RelativeSource AncestorType=UserControl}}"
                Command="{Binding MinButtonCommand, RelativeSource={
			                RelativeSource AncestorType=UserControl}}"
                Background="Transparent"
                HorizontalContentAlignment="Center"
                VerticalContentAlignment="Center"
                VerticalAlignment="Stretch"
                FontFamily="Segoe MDL2 Assets"
                CornerRadius="0"
                Width="35">
            <Button.Styles>
                <Style Selector="Button:pointerover /template/ ContentPresenter">
                    <Setter Property="Background" Value="{StaticResource AKI_Brush_DarkGrayBlue}" />
                    <Setter Property="BorderThickness" Value="0" />
                </Style>
                <Style Selector="Button:pressed /template/ ContentPresenter">
                    <Setter Property="Background" Value="{StaticResource AKI_Background_Light}" />
                </Style>
            </Button.Styles>
        </Button>

        <!-- Close (X) Button -->
        <Button Content="&#xE106;" Grid.Column="3"
                Foreground="{Binding ButtonForeground, RelativeSource={
				             RelativeSource AncestorType=UserControl}}"
                Command="{Binding XButtonCommand, RelativeSource={
			                RelativeSource AncestorType=UserControl}}"
                Background="Transparent"
                HorizontalContentAlignment="Center"
                VerticalContentAlignment="Center"
                VerticalAlignment="Stretch"
                FontFamily="Segoe MDL2 Assets"
                CornerRadius="0"
                Width="35">
            <Button.Styles>
                <Style Selector="Button:pointerover /template/ ContentPresenter">
                    <Setter Property="Background" Value="IndianRed" />
                    <Setter Property="BorderThickness" Value="0" />
                </Style>
                <Style Selector="Button:pressed /template/ ContentPresenter">
                    <Setter Property="Background" Value="Crimson" />
                </Style>
            </Button.Styles>
        </Button>

    </Grid>

</UserControl>