TreeView 中单击节点展开子节点事件
点击父节点（而不是点击前面的“+”号）展开它的子节点呢
我用的vs2005
"+ "   影响我的树显示效果

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用TreeNode.SelectAction = TreeNodeSelectAction.Expand
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正确应该是:
NavigateUrl= " ";
然后设置SelectAction=TreeNodeSelectAction.Explan;

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TreeNode node = new TreeNode(folder.FolderName, folderValue);

node.ImageUrl = FOLDER;
int totalFolder = (folder.Rgt - folder.Lft - 1) / 2;

node.ToolTip = folder.Description;
if (totalFolder > 0)//含有子文件夹
{

node.PopulateOnDemand = true;
}
else
{
node.PopulateOnDemand = false;
}

node.SelectAction = TreeNodeSelectAction.Expand;

treeView.Nodes.Add(node);
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