Inheriting the implicit style not working fine in WinUI 3 for desktop

I have a custom control CustomControl1

public class CustomControl1 : Control
{
    public CustomControl1()
    {
        this.DefaultStyleKey = typeof(CustomControl1);
    }
}

Whose implicit style is

    <Style TargetType="local:CustomControl1">
        <Setter Property="Background" Value="Green"/>
        <Setter Property="Template">
            <Setter.Value>
                <ControlTemplate TargetType="local:CustomControl1">
                    <Border
                        Background="{TemplateBinding Background}"
                        BorderBrush="{TemplateBinding BorderBrush}"
                        BorderThickness="{TemplateBinding BorderThickness}">
                    </Border>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
    </Style>

And a second custom control CustomControl2, inheriting CustomControl1

public class CustomControl2 : CustomControl1
{
    public CustomControl2()
    {
        DefaultStyleKey = typeof(CustomControl2);
    }
}

whose implicit style only sets the Background

    <Style TargetType="local:CustomControl2">
        <Setter Property="Background" Value="Red"/>
    </Style>

The problem is the “Template” of CustomControl1 is not inherited automatically. Therefore nothing is rendered.

This looks as a bug as the implicit style of CustomControl2 doesn’t override Template, so it should take the parent one.

In case that were intentional, there should be at least a way to base the style on the parent control implicit style, I couldn’t find anything, x:Type doesn’t exist in WinUI. Is there any way round?

Here the repo project App12.zip

[arivoir]

This is still a big issue. Is there any light in the horizon?

[roxk]

@arivoir Given the current constraint, I think you best bet is to wrap the control instead of inheriting it. If you need those properties/methods, then you will need to use the adapter pattern to adapt one by one.