isMinimumSizeDirty = true;
    public void intervalAdded(ListDataEvent e)    {      ComboBoxModel model = comboBox.getModel();      ListCellRenderer renderer = comboBox.getRenderer();      if (displaySize == null)        displaySize = getDisplaySize();      if (displaySize.width < getDefaultSize().width)        displaySize.width = getDefaultSize().width;      if (displaySize.height < getDefaultSize().height)        displaySize.height = getDefaultSize().height;      comboBox.repaint();    }