Occurs when a callback for server-side processing is initiated.
The BeginCallback event's data class is ASPxClientBeginCallbackEventArgs. The following properties provide information specific to this event:
|command||Gets a command name that identifies which client action initiated a callback.|
The BeginCallback and ASPxClientRoundPanel.EndCallback events can be used to perform specific client-side actions (for example, to display and hide an explanatory text or picture) while a callback is being processed on the server side.