C++ cbitmap round corners

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C++

MFC

CBitmap

I have a Bitmap m_bitmap. How I make it rounded corner so that I Put this on Button as OnEraseBackground or OnPaint to have a Rounded look. Please Any Help. My code below make Button Round but When I hover the Button it reverse to Rectangle shape.

What I have tried:

CDC dc2;
			dc2.CreateCompatibleDC(pDC);
			CBitmap *oldbmap = dc2.SelectObject(&m_bitmap);

			/*We copy the bitmap into the DC*/
			pDC->BitBlt(0, 0, rect.Width(), rect.Height(), &dc2, 0, 0, SRCCOPY);
			dc2.SelectObject(oldbmap);


			CRgn rgn;
			rgn.CreateRoundRectRgn(0, 0, rect.Width(), rect.Height(), m_ptRound.x, m_ptRound.y);
			SetWindowRgn(static_cast<HRGN>(rgn.GetSafeHandle()), 1);
			rgn.Detach();