How to apply window template

[cocoderus]

I created a custom class and inherited from window

public class AppWindow : Window
{
}

Then I created a ResourceDictionary with a ControlTheme.

<ResourceDictionary xmlns="https://github.com/avaloniaui"
                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
                    xmlns:c="clr-namespace:CustomControlsTst.Controls">
    <!-- Add Resources Here -->
    
    <Design.PreviewWith>
        <c:AppWindow Width="400" Height="400"
                     CornerRadius="5"/>
    </Design.PreviewWith>
    
    <ControlTheme x:Key="{x:Type c:AppWindow}" TargetType="c:AppWindow">
        <Setter Property="Background" Value="{TemplateBinding Background}"/>
        <Setter Property="Title" Value="{TemplateBinding Title}"/>
        <Setter Property="SystemDecorations" Value="None"/>
        <Setter Property="Template">
            <ControlTemplate>
                <Border Background="{TemplateBinding Background}"
                        CornerRadius="{TemplateBinding CornerRadius}"
                        BoxShadow="0 0 30 1 Gray" Margin="30">
                    <ContentPresenter Content="{TemplateBinding Content}"/>
                </Border>
            </ControlTemplate>
        </Setter>
    </ControlTheme>
    
</ResourceDictionary>

However, neither the preview nor the debug version of the code work. If I replace AppWindow with Window, the code works, but all the Window's template is replaced, which I don't need. Is there a bug, or should I do it differently?

[rabbitism]

Change StyleKeyOverride to the type of your Window.
https://docs.avaloniaui.net/docs/basics/user-interface/styling/styles#style-key

[cocoderus]

Thanks. It's worked.