protected void handleClassSelection(@Nullable TypeInfo ref) {
    final XDebugSession debugSession = XDebuggerManager.getInstance(myProject).getCurrentSession();
    if (ref != null && debugSession != null && debugSession.isSuspended()) {
      if (!ref.canGetInstanceInfo()) {
        XDebuggerManagerImpl.getNotificationGroup()
          .createNotification(XDebuggerBundle.message("memory.unable.to.get.instances.of.class", ref.name()),
                              NotificationType.INFORMATION).notify(debugSession.getProject());
        return;
      }

      getInstancesWindow(ref, debugSession).show();
    }
  }
protected void handleClassSelection(@Nullable TypeInfo ref)