Silverlight 4 extends the out-of-browser feature to include support for window customization through the Window class . What this means is that you can turn this: into this: Okay, so that's not necessarily much of an improvement, but you get the idea
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Read the complete post at http://blogs.msdn.com/silverlight_sdk/archive/2010/05/24/creating-a-custom-out-of-browser-window-in-silverlight-4.aspx