Andrew Tokeley has a very good example of borderless windows for Silverlight Out-Of-Browser applications.
Source: Andrew Tokeley's Blog
If you’re creating a Silverlight Out-Of-Browser application then it’s pretty easy to turn off the default window chrome. Simply change the Window Style setting on your Silverlight project to “No Border” (via the Properties dialog –> Out of Browser Settings dialog). However, if you do that you need to take care of resizing, closing and dragging of the window.
In this example, I’m going to assume you have a master page that contains a navigation frame into which your application pages are loaded. This master page can contain all the logic to control your application window.
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