Here is what you can do:
1. Raise a flag if you are going to close the Window via the button that you have added.
2. Change the template of the RadWindow and instead of the Close
command use the Click
event of the Close button. You can easily do this in Expression Blend. Just drop a RadWindow control on the design surface, right-click it and choose from the menu Edit Template-> Edit a Copy
. Then, Blend will generate all the needed resources.
Hope this information helps.
the Telerik team
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