CXTPTabControl can't show any tabs in Dialog

In OnInitDialog function,codes as follows;

{

m_wndTabControl.Create(WS_CHILD|WS_VISIBLE|WS_CLIPCHILDREN|WS_CLIPSIBLINGS, CRect(50, 50, 100, 60), this, IDC_TABCONTROL);
 m_wndTabControl.GetPaintManager()->SetAppearance(xtpTabAppearancePropertyPage2003);
 m_wndTabControl.GetPaintManager()->m_bHotTracking = TRUE;
 m_wndTabControl.GetPaintManager()->m_bShowIcons = TRUE;
 m_wndTabControl.GetPaintManager()->DisableLunaColors(FALSE);
 m_wndTabControl.InsertItem(0, _T("0)", NULL,-1);
 m_wndTabControl.InsertItem(1, _T("1"), NULL,-1);
 m_wndTabControl.InsertItem(2, _T("12"), NULL,-1);

}  why there is nothing in the Dialog. In the sample i modified InsertItem function like this m_wndTabControl.InsertItem(nTab, lpszTitle, NULL, -1); it can show tabs,why? my email: dengjian2@21cn.com