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OnClientDropDownClosing
The OnClientDropDownClosing client-side event that is fired before the dropdown of the RadDropDownTree is closed.
The event handler receives two parameters:
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The instance of the RadDropDownTree client-side object.
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An Event argument parameter.
The event can be cancelled - simply set args.set_cancel to true - args.set_cancel(true); from the event handler and the RadDropDownTree dropdown will not be closed.