Maximizing RadWindow from the header button shows a window with the size of the content if SizeToContent = true. If you maximize with double click on header it is ok.

As a <role> I want <ability> so that <benefit>.

As a user of the RadWindow control I want to be able to close it only by setting the DialogResult property without calling the Close method so that I can use it easily in MVVM scenarious.

As a developer I want to be able to open a modal window that doesn't block the thread so that calling thread stays active while the modal dialog is open (like in Silverlight and XBAP). Create a blog post demonstrating how to use the Show method to simulate this behavior.