Hi Lazar Atanasov,
button is html anchor control which href calls js functin that opens another dialog - properties dialog where control ID is passed as QueryString. When you click on the html anchor this calls window.radopen in the js. You can catch I'm Done
button by creating a ControlDesinger for your control and overriding OnSaving - This method is called when the component is about to be saved. You cannot catch "Cancel" click, because this calls radwindow.Close().
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