void CTreeCtrlEx::OnPaint()
{
CPaintDC dc(this); // device context for painting
阅读背景：
树控件自绘//为什么wm_paint消息里SetTextColor设置字体颜色不行//
来源：互联网
void CTreeCtrlEx::OnPaint()
{
CPaintDC dc(this); // device context for painting
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