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Question: How to change the caption button foreground based on themes(light/dark) [WinUI 3 WinAppSDK 1.1p2]

See original GitHub issue

The documentation mentioned that we can customise the foreground of the caption buttons by defining resources in app.xaml. This neatly sets the colors but these colors are not responsive to the change in the theme.

<Application.Resources>
    <ResourceDictionary>
        <ResourceDictionary.MergedDictionaries>
            <XamlControlsResources xmlns="using:Microsoft.UI.Xaml.Controls" />
            <!-- Other merged dictionaries here -->
        </ResourceDictionary.MergedDictionaries>
        <!-- Other app resources here -->
        <SolidColorBrush x:Key="WindowCaptionBackground">Green</SolidColorBrush>
        <SolidColorBrush x:Key="WindowCaptionBackgroundDisabled">LightGreen</SolidColorBrush>
        <SolidColorBrush x:Key="WindowCaptionForeground">Red</SolidColorBrush>
        <SolidColorBrush x:Key="WindowCaptionForegroundDisabled">Pink</SolidColorBrush>
    </ResourceDictionary>
</Application.Resources>

I have tried defining these resources in the Dark and Light section of the dictionary, however I could not make it work. Is it that the caption buttons are ignoring these changes? or I am doing something incorrect. My App is based on WinAppSDK 1.1 preview 2.

    <Application.Resources>
        <ResourceDictionary>
            <ResourceDictionary.MergedDictionaries>
                <XamlControlsResources xmlns="using:Microsoft.UI.Xaml.Controls" /><ResourceDictionary>
                    <ResourceDictionary.ThemeDictionaries>
                        <ResourceDictionary x:Key="Default">
                            <Color x:Key="CaptionColor">#FFFFFF</Color>
                            <Color x:Key="CaptionColorDisabled" >#5DFFFFFF</Color>
                        </ResourceDictionary>
                        <ResourceDictionary x:Key="Light">
                            <Color x:Key="CaptionColor">#E4000000</Color>
                            <Color x:Key="CaptionColorDisabled" >#5C000000</Color>
                        </ResourceDictionary>
                        <ResourceDictionary x:Key="Dark">
                            <Color x:Key="CaptionColor">#FFFFFF</Color>
                            <Color x:Key="CaptionColorDisabled" >#5DFFFFFF</Color>
                        </ResourceDictionary>
                        <ResourceDictionary x:Key="HighContrast">
                            <Color x:Key="CaptionColor">#E4000000</Color>
                            <Color x:Key="CaptionColorDisabled" >#5C000000</Color>
                        </ResourceDictionary>
                    </ResourceDictionary.ThemeDictionaries>
                    <SolidColorBrush x:Key="WindowCaptionForeground" Color="{ThemeResource CaptionColor}"/>
                    <SolidColorBrush x:Key="WindowCaptionForegroundDisabled" Color="{ThemeResource CaptionColorDisabled}" />
                    <SolidColorBrush x:Key="WindowCaptionBackground" Color="Transparent"/>
                    <SolidColorBrush x:Key="WindowCaptionBackgroundDisabled" Color="Transparent" />
                </ResourceDictionary>
            </ResourceDictionary.MergedDictionaries>
        </ResourceDictionary>
    </Application.Resources>