message: Use ListBox::selected() in ComboBox::selectionTag()
diff: @@ -169,7 +169,7 @@ const std::string& ComboBox::selectionText() const
  */
  int ComboBox::selectionTag() const
  {
  - return lstItems.selectionTag();
  + return lstItems.isItemSelected() ? lstItems.selected().tag : 0;
  }
  