TActivePanel
API Manual
TActivePanel is the TPanel active control counterpart.
TActivePanel allows the client-side panel contents to be updated during a
callback response using the render method.
Example: Assume $param is an instance of TCallbackEventParameter attached to
the OnCallback event of a TCallback with ID "callback1", and
"panel1" is the ID of a TActivePanel.
function callback1_requested($sender, $param)
{
$this->panel1->render($param->getNewWriter());
}