Setting WP7 SystemTray colors in XAML

Is it possibl开发者_如何学Pythone to set the SystemTray colors (ForegroundColor & BackgroundColor) in XAML?

It works when I set them in code behind but not in XAML.

I'm using the Mango Beta 2 SDK but there appear to be a number of blog articles which were posted in the timespan of the first beta which report this working with XAML.

I've tested this in the emulator only.

I think it's a bug in the current build as it seems that the newer build fixes it. I assume the newer build is internal-only at the moment.