@Override
  protected void update(){
    if (!myHasFindWhatPanel){
      setOKActionEnabled(true);
    }
    else{
      getFindUsagesOptions().setRoot((ThrowSearchUtil.Root)myCbExns.getSelectedItem());
      final boolean hasSelected = isSelected(myCbUsages);
      setOKActionEnabled(hasSelected);
    }
  }
@Override
  protected void update()