在右键单击时添加代码// Select the item that is at the point myPoint.
UINT uFlags;
HTREEITEM hItem = pmyTreeCtrl->HitTest(point, &uFlags);//pmyTreeCtrl为CtreeCtrl控件指针if ((hItem != NULL) && (TVHT_ONITEM & uFlags))
{
   pmyTreeCtrl->Select(hItem, TVGN_CARET);
}