How to get resize callbacks for a dockable plugin window?

Hi All,

          I'm going through Panelator plugin. It comes as a separate window. I want some callback when the window is getting resized or moved. What kind of event I need to register for gtting the callback. Any suggestions will help me a lot.

I tried using foillowing method, but I'm not getting the callback. I thought kEventClassWindow is related to window events.

static const EventTypeSpec  kDrawEventSpec[] = {kEventClassControl,  kEventControlDraw, kEventClassWindow };
   
OSErr    err = InstallEventHandler (GetControlEventTarget (i_refH),
                                        NewEventHandlerUPP (S_EventHandler),
                                        1,
                                        kDrawEventSpec,
                                        (void *) this,
                                        NULL);

Thanks,

Dheeraj.