ATL的OnCreate问题？

Question

用ATL写的一个控件重载OnCreate为什么没有执行？

Answer 1

class ATL_NO_VTABLE CYTLine : 
public CComObjectRootEx<CComSingleThreadModel>,
public CStockPropImpl<CYTLine,IYTLine,&IID_IYTLine, &LIBID_CLINELib>,
public CComControl<CYTLine>,
public IPersistStreamInitImpl<CYTLine>,
public IOleControlImpl<CYTLine>,
public IOleObjectImpl<CYTLine>,
public IOleInPlaceActiveObjectImpl<CYTLine>,
public IViewObjectExImpl<CYTLine>,
public IOleInPlaceObjectWindowlessImpl<CYTLine>,
public ISupportErrorInfo,
public IConnectionPointContainerImpl<CYTLine>,
public IPersistStorageImpl<CYTLine>,
public ISpecifyPropertyPagesImpl<CYTLine>,
public IPerPropertyBrowsingImpl<CYTLine>,
public IQuickActivateImpl<CYTLine>,
public IDataObjectImpl<CYTLine>,
public IProvideClassInfo2Impl<&CLSID_YTLine, &DIID__IYTLineEvents, &LIBID_CLINELib>,
public IPropertyNotifySinkCP<CYTLine>,
public CComCoClass<CYTLine, &CLSID_YTLine>,
public CProxy_IYTLineEvents< CYTLine >的一个类，重载OnCreate为什么没有执行？

Answer 2

CYTLine()
{
    m_bWindowOnly = TRUE;
}BEGIN_MSG_MAP(CGrid)
...
    //add the next line
    MESSAGE_HANDLER(WM_CREATE,OnCreate);
END_MSG_MAP()LRESULT OnCreate(UINT, WPARAM , LPARAM , BOOL& )
{
    //ToDo
}