[Update - 9/13/06] This seems to not work using RC1 - using DwmEnableBlurBehindWindow seems to work fine creating areas of glass, but DwmExtendFrameIntoClientArea does not - you get nothing but a black rectangle. I'm trying to figure out why and I'll create another post if I do... if you do, please feel free to comment here or point me to your posting! I've seen a fair number of questions on using Glass in Vista forms, and I've seen a few answers as well. However, the answers I've seen involve using Windows.Forms transparent forms support [1]. There's a big downside...