@Override
    public void initTabContent(@NotNull Content content) {
      ShelfToolWindowPanel panel = getInstance(myProject).initToolWindowPanel();
      content.setHelpId(HELP_ID);
      content.setComponent(panel);
      content.setDisposer(panel);
      content.setPreferredFocusableComponent(panel.myTree);
    }
@Override
    public void initTabContent(@NotNull Content content)