Hi I can't seem to disable the acrylic effect on the RadTabControl. I have it nested inside a dockpanel that's inside a RadWindow, but as long as the RadWindow has acrylic applied, the RadTabControl's HeaderBackground does too, I've tried changing the IsAcrylic property for the tabcontrol in both XAML and cs and neither seem to work. It's either both the RadWindow and the RadTabControl have the transparent acrylic effect, or neither of them do. Is there something I'm missing or is this a bug?