Thankyou very much Victor. I tried to extract the HDC from the owl context.

But somehow it doesnot work
Code:
HDC hdc = dc.GetHDC();
	CFont* pCurrent = hdc.GetCurrentFont();

LOGFONT lf ;
pCurrent->GetLogFont(&lf) ;
lf.lfHeight -= -4 ; // make the font larger by 4
// yopu may need to check what you actually get in the LOGFONT object at this point
// to make sure you adjust the correct parameter, in the right direction to make the font bigger
CFont local_font ;

local_font.CreateFontIndirect(&lf) ;

pDC->SelectObject(&local_font) ;
DrawText(...) ;
pDC->SelectObject(pCurrent) ;