Thank you for contacting us.
You can customize very easy the Window with Expression Blend. Just drop the control in the design surface, right-click it and choose from the context menu Edit Template->Edit a Copy
. Then Blend will generate for you the Style of the Window. You can remove the Header and set CornerRadius
to the borders.
Attached I am sending you a sample project in which the above mentioned steps are performed.
If you need further assistance please let us know.
All the best,
the Telerik team
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