高手请指点>>>如何在TreeView的节点上定义contextmenu??

private void treeViewBox_MouseDown(object sender, System.Windows.Forms.MouseEventArgs e)
{
this.treeViewBox.ContextMenu = null;
node = this.treeViewBox.GetNodeAt(e.X,e.Y);
} private void treeViewBox_MouseUp(object sender, System.Windows.Forms.MouseEventArgs e)
{
                           if(node....)
                               this.treeViewBox.ContextMenu = .....
                   }