fis/fis/SlaveWindow.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"
		xmlns:titlebars="clr-namespace:fis;assembly=fis"
        mc:Ignorable="d" d:DesignWidth="800" d:DesignHeight="450"
        x:Class="fis.SlaveWindow"
        Title="FLYINSONO">
	<Grid>
		<Border Name="WindowBorder" BorderBrush="#BFBFBF" BorderThickness="1">
			<Grid>
				<Grid.RowDefinitions>
					<RowDefinition Height="32"/>
					<RowDefinition Height="*"/>
				</Grid.RowDefinitions>
				<Grid Grid.Row="0">
					<titlebars:WindowsTitleBar Name="WinTitleBar" IsSeamless="True"/>
					<titlebars:MacosTitleBar  Name="MacTitleBar" IsSeamless="False"/>
				</Grid>
				<Border Grid.Row="1" BorderThickness="0" x:Name="BrowserBorder"/>
			</Grid>
		</Border>
	</Grid>
</Window>