@Override
    public boolean isSelectable(T value) {
      Component component = myGetRenderer.get().getListCellRendererComponent(myProxyList, value, -1, false, false);
      return !((component instanceof ComboBox.SelectableItem selectableItem && !selectableItem.isSelectable())
               || component instanceof JSeparator);
    }
@Override
    public boolean isSelectable(T value)