quickinfosession background

Hello,

Thank you for the sample project.  There is an IntelliPromptQuickInfo element that is created by the session to wrap all content.  It has Padding by default, which allows the white IntelliPromptQuickInfo background of the theme to show through.  Also a TextBlock Background will never cover area outside of the text itself, so it's better to set the Background of our element like this:

public class MyQuickInfoSession : QuickInfoSession {

    protected override IntelliPromptQuickInfo CreatePopupContent() {
        var element = base.CreatePopupContent();
        // NOTE: You could change Padding here too
        element.Background = Brushes.Yellow;
        return element;
    }

}

Then update your code to:

1. Use this class instead of the default QuickInfoSession.
2. Remove your "Background = Brushes.Red" on the TextBlock.

After that, you'll see a Yellow background that fills the whole popup.