让treeview控件在失去焦点时仍能高亮显示当前选中的节点

方法： 在属性页上吧HideSelection勾掉。但是淡灰色，颜色不醒目。 

借助以下资料

Treeview控件--Name：tVtypeList

将tVtypeList的HideSelection属性设置为False，DrawMode属性设置为OwnerDrawText

将tVtypeList的DrawNode事件写为：

private void tVtypeList_DrawNode(object sender, DrawTreeNodeEventArgs e)

        {

            e.Graphics.FillRectangle(Brushes.White, e.Node.Bounds);

            if (e.State == TreeNodeStates.Selected)//做判断

            {

                e.Graphics.FillRectangle(Brushes.CornflowerBlue, new Rectangle(e.Node.Bounds.Left, e.Node.Bounds.Top,e.Node.Bounds.Width, e.Node.Bounds.Height));//背景色为蓝色

RectangleF drawRect = new RectangleF(e.Bounds.X, e.Bounds.Y, e.Bounds.Width + 10, e.Bounds.Height);

                e.Graphics.DrawString(e.Node.Text, tVtypeList.Font, Brushes.White,  drawRect  );

//字体为白色

            }

            else

            {

                e.DrawDefault = true;

            }

        }