如何让DevExpress TreeList的每个结点高亮显示？

private void treeList1_CustomDrawNodeCell(object sender, DevExpress.XtraTreeList.CustomDrawNodeCellEventArgs e)

{

TreeList node = sender as TreeList;

if(e.Node == node.FocusedNode)

{

e.Graphics.FillRectangle(SystemBrushes.Window, e.Bounds);

Rectangle r = new Rectangle(e.EditViewInfo.ContentRect.Left,
e.EditViewInfo.ContentRect.Top,
Convert.ToInt32(e.Graphics.MeasureString(e.CellText,treeList1.Font).Width + 1),
Convert.ToInt32(e.Graphics.MeasureString(e.CellText,treeList1.Font).Height));

e.Graphics.FillRectangle(SystemBrushes.Highlight, r);

e.Graphics.DrawString(e.CellText, treeList1.Font, SystemBrushes.HighlightText, r);

e.Handled = true;
}
}