[MFC] TreeCtrl 전체 노드 확장하기

	// 전체 Tree 확장
	std::function< void (HTREEITEM) > ldExpand = [&](HTREEITEM hItem)
	{
		if ( m_treeLibrary.ItemHasChildren(hItem) )
		{
			m_treeLibrary.Expand( hItem, TVE_EXPAND );
			HTREEITEM hChild = m_treeLibrary.GetChildItem(hItem);
			if ( hItem != nullptr ) ldExpand(hChild);
		}

		hItem = m_treeLibrary.GetNextSiblingItem(hItem);
		if ( hItem != nullptr ) ldExpand(hItem);
	};

	HTREEITEM hRootItem = m_treeLibrary.GetRootItem();
	ldExpand(hRootItem);