tooltip.setPopupDelay(2500);
tooltip.activate();
IWorkbenchWindow window = PlatformUI.getWorkbench().getActiveWorkbenchWindow();
IPartService service = window.getPartService();
service.addPartListener(this);
IWorkbenchPartReference aref = service.getActivePartReference();
if (aref != null) {
IWorkbenchPart apart = aref.getPart(false);
installSelectionListener(apart);