我使用代码使得TreeView控件全部展开if (treeView1.SelectedNode.Index==0)                        {                            if (i == 0)                            {                                this.treeView1.CollapseAll();                                                                i = 1;                            }                            else                            {                                this.treeView1.ExpandAll();                                i = 0;                            }                         } 展开后,滚动条自动滚动到最下边。如何让滚动条滚动到最上边。并选中下一个同级菜单。
                    
                    
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