Preview 4 SetTitleBar- standard max, min and close buttons not selectable

Describe the bug With a custom titlebar set in a preview 4 Desktop app the standard minimize, maximize and close buttons are visible but not actually selectable. Window is draggable via the custom titlebar as expected.

Steps to reproduce the bug Steps to reproduce the behavior:

1. Create a WinUI 3 desktop app based upon preview 4
2. Define a UIElement for the custom titlebar.
   <Grid x:Name="AppTitleBar" Grid.Row="0" Background="Transparent" Visibility="Collapsed"> <Grid.ColumnDefinitions> <ColumnDefinition Width="Auto"/> <ColumnDefinition/> <ColumnDefinition Width="Auto"/> <ColumnDefinition Width="Auto"/> </Grid.ColumnDefinitions> <Image Source="Images/hpe-eaas-logo-transparent.png" Grid.Column="1" HorizontalAlignment="Left" VerticalAlignment="Center" Width="20" Height="20" Margin="5,0"/> <TextBlock Text="EaaS Q2C Platform" Foreground="White" Grid.Column="1" VerticalAlignment="Center" Style="{StaticResource CaptionTextBlockStyle}" Margin="31,0,0,0"/> <Image Source="Images/hpe-element.png" Grid.Column="1" HorizontalAlignment="Center" VerticalAlignment="Center" Height="20"/> </Grid>
3. Use the required extend and set methods: ExtendsContentIntoTitleBar = true; SetTitleBar(AppTitleBar);

Expected behavior Standard buttons are both visible and selectable.

Screenshots

Version Info Microsoft.WinUI v3.0.0-preview4.210210.4 Win 10 version 20H2

Device form factor	Saw the problem?
Desktop

[RythenGlyth]

If someone still has this error you can fix it for now (until it will eventually work) by adding IsHitTestVisible="False" to the Custom Title bar in your case AppTitleBar

[marb2000]

Reopening per internal conversation. This is a bug that should be fixed. @pratikone I’m assigning this to you given you are working on it.