} else { throw new RuntimeException("Unable to insert the item because the data model it is not an instance of MutableComboBoxModel."); }
else throw new RuntimeException("Unable to insert the item because the data " + "model it is not an instance of " + "MutableComboBoxModel.");
  public void insertItemAt(Object element, int index)  {	if(dataModel instanceof MutableComboBoxModel) {    ((MutableComboBoxModel) dataModel).insertElementAt(element, index);	} else {		throw new RuntimeException("Unable to insert the item because the data model it is not an instance of MutableComboBoxModel.");	}  }