@Override
      protected void onDoubleClick(CheckedTreeNode node) {
        if (node instanceof BreakpointsGroupNode) {
          TreePath path = TreeUtil.getPathFromRoot(node);
          if (isExpanded(path)) {
            collapsePath(path);
          }
          else {
            expandPath(path);
          }
        }
        else {
          navigate(false);
        }
      }
@Override
      protected void onDoubleClick(CheckedTreeNode node)