TreeView控件如何控制滚动条的位置

TreeNode.EnsureVisible():

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

滚动条移动到顶端:

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