treeViewer.setSorter(new ViewerSorter());
  public void createControl(Composite _parent) {    super.createControl(_parent);    TreeViewer treeViewer = getTreeViewer();    treeViewer.setContentProvider(new EOModelOutlineContentProvider());    treeViewer.setLabelProvider(new EOModelOutlineLabelProvider());    if (myModel != null) {      treeViewer.setInput(new EOModelContainer(myModel));    }    treeViewer.expandToLevel(2);    setFocus();  }