@Override
 public void addToSlot(Object slot, IsWidget content) {
   if (slot == MainTabBasicListPresenterWidget.TYPE_VmListContent) {
     vmPanel.add(content);
   } else {
     super.addToSlot(slot, content);
   }
 }
 @Override
 public void setInSlot(Object slot, IsWidget content) {
   if (slot == MainTabBasicListPresenterWidget.TYPE_VmListContent) {
     vmPanel.clear();
     if (content != null) {
       vmPanel.add(content);
     }
   } else {
     super.setInSlot(slot, content);
   }
 }