Hello Bichitra,
You can use the
CloseMode property. If you set
CloseMode="Close", the "x" button will close your window. If this property is set to "Hide", the window will be only hidden.
About the second question - you should handle the
PreviewClosed event. It is fired before the
Close event.
Hope this will work for you. If you have any problems with that, please feel free to ask.
Sincerely yours,
Boyan
the Telerik team
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