TreeView控件如何控制滾動條的位置

TreeNode.EnsureVisible():

　　Ensures that the tree node is visible, expanding tree nodes and scrolling the tree view control as necessary.

滾動條移動到頂端:

this.treeView1.SelectedNode = this.treeView1.Nodes[0];
this.treeView1.Nodes[0].EnsureVisible();