Occurs before the built-in event dialog is shown. Return false or call event.preventDefault() in order to cancel event and prevent the built-in dialog to be shown. args.data - the event data. args.targetCell - target offset DOM element which can be used for popup callout.

'Declaration
 
Public Property OnClientBeforeEditEventDialogShow As System.String

public System.string OnClientBeforeEditEventDialogShow {get; set;}