@Override
  protected PsiElement getElementFromDescriptor(@NotNull HierarchyNodeDescriptor descriptor) {
    if (descriptor instanceof MethodHierarchyNodeDescriptor) {
      return ((MethodHierarchyNodeDescriptor)descriptor).getTargetElement();
    }
    return null;
  }
@Override
  protected PsiElement getElementFromDescriptor(@NotNull HierarchyNodeDescriptor descriptor)