est' class ClassName : public CWinThread

BEGIN_MESSAGE_MAP(ClassName , CWinThread)
      ON_THREAD_MESSAGE(WM_DO_IT, OnDoIt) 
END_MESSAGE_MAP()

na VS6 idet kak po maslu
na VS2005 vidaet oshibku

error C2440: 'static_cast' : cannot convert from 'LRESULT (__thiscall ClassName ::* )(WPARAM,LPARAM)' to 'void (__thiscall CWinThread::* )(WPARAM,LPARAM)'

Budu priznatelen esli kto vtolkuet kak razgresti

Spasibo.