@Nullable
  private AntBuildFileNodeDescriptor getCurrentBuildFileNodeDescriptor() {
    final Tree tree = myTree;
    if (tree == null) {
      return null;
    }
    final TreePath path = tree.getSelectionPath();
    if (path == null) {
      return null;
    }
    DefaultMutableTreeNode node = (DefaultMutableTreeNode)path.getLastPathComponent();
    while (node != null) {
      final Object userObject = node.getUserObject();
      if (userObject instanceof AntBuildFileNodeDescriptor) {
        return (AntBuildFileNodeDescriptor)userObject;
      }
      node = (DefaultMutableTreeNode)node.getParent();
    }
    return null;
  }
@Nullable
  private AntBuildFileNodeDescriptor getCurrentBuildFileNodeDescriptor()