How to change the background color of Canvas associated to ItemsControl using C# Markup?

[kucint]

I want to change the background color of Canvas associated to ItemsControl:
To do so I produced following code:

public sealed partial class MainPage : Page
{
    public MainPage() => this
            .Background(ThemeResource.Get<Brush>("ApplicationPageBackgroundThemeBrush"))
            .Content(
              new ItemsControl()
              .ItemsPanel(
                  () => new Canvas()
                  // uncommenting any of the following lines will cause the app to crash
                  //.Width(250)
                  //.Height(250)
                  //.Background(Colors.DarkBlue)
                  ));
}

Unfortunately, this doesn't work, it causes app to crash:

Exception thrown: 'System.ArgumentException' in WinRT.Runtime.dll
An exception of type 'System.ArgumentException' occurred in WinRT.Runtime.dll but was not handled in user code

The equivalent Code in XAML would be:

      <ItemsPanelTemplate>
        <Canvas Background="Transparent"/>
      </ItemsPanelTemplate>
    </ItemsControl.ItemsPanel>

BTW: modifying Width or Height of a Canvas causes the crash as well.

How do I realize it in C# Markup?

See attached uno project that reproduces this issue:
UnoCanvasApp.16091.zip

[dansiegel]

Thanks @kucint this would actually be the result of a bug we recently discovered. The team is currently working to resolve it. The fix should be in the 5.2 release. Note that to properly fix this we will need to make a breaking change that is specific to the ItemsPanelTemplate. The updated code will look something like this:

new ItemsControl()
    .ItemsPanel<Canvas>(canvas => canvas
        .Width(250)
        .Height(250)
        .Background(Colors.Blue))

cc: @kazo0 @eriklimakc @vatsashah45