Drawing Window Background on Canvas

Hi,
I’m trying to add a little information pane to my app, as shown in this post on this old forum:
http://forums.realsoftware.com/viewtopic.php?p=82521&sid=5fef244f397c62d3f36e53d5b126908c#p82521

How do I get the “Information” title bar to have the same gradient background as my unified window?

Thank you.