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RadPopupControlBaseOnPopupOpening Method
Fires when the popup is about to open.

Namespace: Telerik.WinControls.UI
Assembly: Telerik.WinControls.UI (in Telerik.WinControls.UI.dll) Version: 2018.3.1016.40 (2018.3.1016.40)
Syntax
protected virtual void OnPopupOpening(
	CancelEventArgs args
)

Parameters

args
Type: System.ComponentModelCancelEventArgs
A CancelEventArgs object that contains information about the event
See Also