Based on Viktor La CroixKapitán Mlíko's answer with source above, I would change it to use the following:
It's a better practice to use the Marlett font rather than Path Data points for the Minimize, Restore/Maximize and Close buttons.
<StackPanel Orientation="Horizontal" HorizontalAlignment="Right" VerticalAlignment="Top" WindowChrome.IsHitTestVisibleInChrome="True" Grid.Row="0"> <Button Command="{Binding Source={x:Static SystemCommands.MinimizeWindowCommand}}" ToolTip="minimize" Style="{StaticResource WindowButtonStyle}"> <Button.Content> <Grid Width="30" Height="25"> <TextBlock Text="0" FontFamily="Marlett" FontSize="14" VerticalAlignment="Center" HorizontalAlignment="Center" Padding="3.5,0,0,3" /> </Grid> </Button.Content> </Button> <Grid Margin="1,0,1,0"> <Button x:Name="Restore" Command="{Binding Source={x:Static SystemCommands.RestoreWindowCommand}}" ToolTip="restore" Visibility="Collapsed" Style="{StaticResource WindowButtonStyle}"> <Button.Content> <Grid Width="30" Height="25" UseLayoutRounding="True"> <TextBlock Text="2" FontFamily="Marlett" FontSize="14" VerticalAlignment="Center" HorizontalAlignment="Center" Padding="2,0,0,1" /> </Grid> </Button.Content> </Button> <Button x:Name="Maximize" Command="{Binding Source={x:Static SystemCommands.MaximizeWindowCommand}}" ToolTip="maximize" Style="{StaticResource WindowButtonStyle}"> <Button.Content> <Grid Width="31" Height="25"> <TextBlock Text="1" FontFamily="Marlett" FontSize="14" VerticalAlignment="Center" HorizontalAlignment="Center" Padding="2,0,0,1" /> </Grid> </Button.Content> </Button> </Grid> <Button Command="{Binding Source={x:Static SystemCommands.CloseWindowCommand}}" ToolTip="close" Style="{StaticResource WindowButtonStyle}"> <Button.Content> <Grid Width="30" Height="25"> <TextBlock Text="r" FontFamily="Marlett" FontSize="14" VerticalAlignment="Center" HorizontalAlignment="Center" Padding="0,0,0,1" /> </Grid> </Button.Content> </Button> 
