MFC中CTreeCtrl展开树形列表节点

void CMenuCreatDlg::OnMENUITEMexpandtree() //展开所有节点{    // TODO: Add your command handler code here     MyExpandTree(m_tree.GetRootItem()); } void CMenuCreatDlg::MyExpandTree(HTREEITEM hTreeItem){    if(!m_tree.ItemHasChildren(hTreeItem))    {        return;    }    HTREEITEM hNextItem = m_tree.GetChildItem(hTreeItem);    while (hNextItem != NULL)    {        MyExpandTree(hNextItem);        hNextItem = m_tree.GetNextItem(hNextItem, TVGN_NEXT);    }    m_tree.Expand(hTreeItem,TVE_EXPAND);}