Device managed to engine managed

Hi all,
I have a monolithic printer driver and I wish that the gdi calls my hooked
functions but should my driver be unable to render the surface given I wish
to be able to punt to the gdi to render it for me.

now in my DrvEnablePDEV I have the folloing code

//allocating a monochrome page size bitmap
pPDev->pbBitmap = (LPBYTE)LocalAlloc(LPTR, pPDev->HorzRes * pPDev->VertRes);

// Creating and associating the surface
(HBITMAP)pPDev->hsurf =
(HBITMAP)EngCreateBitmap(SurfSize,SurfSize.cx,BMF_1BPP, BMF_USERMEM |
BMF_TOPDOWN, NULL);
bRet = EngAssociateSurface((HSURF)pPDev->hsurf, (HDEV)pPDev->hpdev,
HOOK_BITBLT | HOOK_STROKEPATH | HOOK_TEXTOUT | HOOK_COPYBITS |
HOOK_FILLPATH | HOOK_STRETCHBLT | HOOK_STROKEANDFILLPATH);

//returning the surface created
return((HSURF)pPDev->hsurf);

Now assuming that I dont now how to render a TextOut call I wish to punt it
to the GDI to create the Bitmap for me:

// Punt call to GDI if no special rendering can be done
pso->iType = STYPE_BITMAP;
if (EngTextOut(pso, pstro, pfo, pco, prclExtra, prclOpaque, pboFore,
pboOpaque, pptlBrushOrg, mix ) == DDI_ERROR)
{
return DDI_ERROR;
}

What happens is that my bitmap buffer is not getting filled, it remains full
of 0s.

I have read that there is a way to actually do the operation above but
unfortunatley I still cannot find out how to code such an operation.

Could anyone please hint me on whats missing in my code or what should I do.

Thanks alot
Adam