@Override
  public void clearChildren() {
    myCachedAllChildren = null;
    myMessageChildren = null;
    myTemporaryMessageChildren = null;
    myTemporaryEditorNode = null;
    myValueChildren = null;
    myTopGroups = null;
    myBottomGroups = null;
    fireNodeStructureChanged();
  }
@Override
  public void clearChildren()