TitleBar.xaml

<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"
  xmlns:fvim = "clr-namespace:FVim;assembly=FVim"
  Focusable  = "False"
  Design.Width="400"
  FontFamily="{Binding FontFamily}" 
  FontSize="{Binding FontSize}" 
  Foreground="{Binding NormalForeground}"
  Background="{Binding NormalBackground}"
  x:Class   = "FVim.TitleBar">
  <Design.DataContext>
    <fvim:TitleBarSampleData />
  </Design.DataContext>
  <Grid>
    <Grid.RowDefinitions>
      <RowDefinition />
    </Grid.RowDefinitions>
    <Grid.ColumnDefinitions>
      <ColumnDefinition Width="32" />
      <ColumnDefinition Width="1*" />
      <ColumnDefinition Width="32" />
      <ColumnDefinition Width="32" />
      <ColumnDefinition Width="32" />
    </Grid.ColumnDefinitions>
    <Grid.Styles>
      <Style Selector="Button">
        <Setter Property="Background" Value="{Binding NormalBackground}" />
        <Setter Property="Foreground" Value="{Binding NormalForeground}" />
        <Setter Property="BorderBrush" Value="Transparent" />
      </Style>
      <Style Selector="Button[IsPointerOver=True]">
        <Setter Property="Background" Value="{Binding SelectBackground}" />
        <Setter Property="Foreground" Value="{Binding SelectForeground}" />
      </Style>
      <Style Selector="Button[IsPressed=True]">
        <Setter Property="Background" Value="{Binding HoverBackground}" />
        <Setter Property="Foreground" Value="{Binding HoverForeground}" />
      </Style>
      <Style Selector="Button.inactive">
        <Setter Property="Foreground" Value="{Binding InactiveForeground}" />
      </Style>
      <Style Selector="TextBlock.inactive">
        <Setter Property="Foreground" Value="{Binding InactiveForeground}" />
      </Style>
    </Grid.Styles>
    <Image Source="/Assets/fvim.png" Grid.Column="0" Margin="3,3,3,3" Stretch="Uniform" Height="16" />
    <TextBlock Name="Title" Classes="inactive" Text="{Binding $parent[fvim:TitleBar].Title}" Grid.Column="1" VerticalAlignment="Center" />
    <Button Name="MinimizeButton" Classes="inactive" Content="__" Grid.Column="2" Focusable="False" />
    <Button Name="MaximizeButton" Classes="inactive" Content="O" Grid.Column="3" Focusable="False" />
    <Button Name="CloseButton" Classes="inactive" Content="X" Grid.Column="4" Focusable="False" />
  </Grid>
</UserControl>