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class CMyCtl : public CStatic
{
public:
CMyCtl(const string &filename);
private:
CTreeCtrl m_tree;
};
CWnd *pWnd = GetDlgItem(IDC_ZOOM_CTRL);
m_zoomCtrl.Create(NULL, "CScrollWnd", WS_CHILD | WS_VISIBLE |WS_HSCROLL | WS_VSCROLL,
CRect(0,0,0,0), pWnd, NULL);
CRect rc;
pWnd->GetWindowRect(&rc);
pWnd->ScreenToClient(&rc);
m_zoomCtrl.MoveWindow(&rc);