DevExpress XtraTreeList的复选框禁用

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树的2个事件代码如下,通过节点的tag判断是否禁用节点前的复选框.树的节点加载时设置要禁用的节点tag为-1,不禁用的则设为相关的值

private void treeListPer_CustomDrawNodeCheckBox(object sender, DevExpress.XtraTreeList.CustomDrawNodeCheckBoxEventArgs e)
{
//TreeListNode listNode = sender as TreeListNode;
if (e.Node.Tag.ToString()=="-1")
{
e.ObjectArgs.State = DevExpress.Utils.Drawing.ObjectState.Disabled;
}
}

private void treeListPer_BeforeCheckNode(object sender, DevExpress.XtraTreeList.CheckNodeEventArgs e)
{
if (e.Node.Tag.ToString() == "-1")
{
e.State = CheckState.Unchecked;
}
}