Could you please give us some more details about your implementation of the RadWindow - initially, when maximized the window should take up the whole application (Silverlight plug-in). Could you please send us some screenshots and code snippets. Alternatively, a sample project which demonstrates the issue will be very helpful.
Also, you can check out this
forum post in which is illustrated how to center the RadWindow in the browser, but you could use the same approach for setting the Width of the window.
Hope this information helps. Please let us know if you have further questions.
All the best,
the Telerik team
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