HATOMTBL hatomtbl = WinQuerySystemAtomTable(); WinDeleteAtom(hatomtbl, mMsgWindowAtom);
    NS_IMETHOD Destroy() {        nsresult retval = NS_OK;        if ( mHandle ) {            // DestroyWindow can only destroy windows created from            //  the same thread.            BOOL desRes = WinDestroyWindow( mHandle );            if ( FALSE != desRes ) {                mHandle = NULL;            }            else {                retval = NS_ERROR_FAILURE;            }        }        return retval;    }