Skinning popup titlebars?

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How do you skin the titlebars of popup non-maximized windows? I saw a screenshot of an error popup with a non-standard titlebar graphic, and mine is just flat black. :/

Most of these are PNG files. So if you go to \Windows on your phone, you can copy all the PNG images to your PC and find the images that you want to skin. It takes a lot of work as some of the file names do not necessarily tell you what they are for unless you plan on skinning on all of them. I thought about it but it was too much work.