about the an example code on codeguru

On www.codeguru.com,there is a topic concerned on changing the background color of treeview.In the example code,it does something on the OnPaint of CTreeCtrl.(http://www.codeguru.com/treeview/ctrl_color.shtml)But I really don't know how can I handle the CTreeCtrl's OnPaint()in CTreeView,what I can handle is only the OnPaint() os CTreeView,but that does nothing usefull.any one who have already read the topic in codeguru can give me some advice?How can I handle the OnPaint() of CTreeCtrl in a CTreeView?

thanks
yuqiangAsked:
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richhxbCommented:
Use CTreeView::GetTreeCtrl to get a reference of the tree
control associated with the view, then create your own
CTreeCtrl class, and in your own CMyTreeCtrl, use
SubclassWindow(m_MyTreeView.GetTreeCtrl()->m_hWnd) to
subclass it.

Now you can handle the OnPaint() of CTreeCtrl in your
CTreeView.



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yuqiangAuthor Commented:
hi,richhxb,

thank you for your kindly answer.But when I tried under your diction,I got an ASSERT failure in wincore.cpp line 315.It seem that the treectrl has already been attach to the treeview(treeview.m_hWnd == treectrl.m_hWnd),so the treectrl can not be attach to the CMyTreeCtrl.

Since the CTreeView and the CTreeCtrl has the same m_hWnd,does all the message sent to the CTreeCtrl is sent to the CTreeView? If it is true,the CTreeView's OnPaint() is equal to CTreeCtrl's OnPaint(),But why I can not get the desired result by handle the CTreeView's OnPaint()? Would you so kind have a look at http://www.codeguru.com/treeview/ctrl_color.shtml and give me some advice?I can not contact with the author of that URL.

If you like ,you can  give me email directly.(yuq@wayx.com)

thank you again.

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