Changing border style of attached view

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   I am attaching a CTreeView derived class to a CXTPDockingPane. That is
OK, but when the view is displayed in the docking pane it has WS_BORDER
style. I want to change the border style to be like the examples with
the CTreeCtrl and with WS_EX_STATICEDGE. (I does not want a deep border)

The code bellow does not work:

BOOL CDerivedTreeView::PreCreateWindow(CREATESTRUCT& cs) 

{

    cs.style ^= WS_BORDER;

    cs.style |= TVS_HASLINES | TVS_LINESATROOT | TVS_HASBUTTONS | TVS_SHOWSELALWAYS;

    cs.dwExStyle |= WS_EX_STATICEDGE;

    return CTreeView::PreCreateWindow(cs);

}

Please, help me to resolve this?