how do Regions from Bitmaps?

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C++

API

i'm trying build Regions from a Bitmaps:

HRGN CreateRegionFromBitmap(HBITMAP hBitmap, COLORREF transparentColor)
{
	HRGN hRgn = NULL;
	HRGN hRgn1 = NULL;

	// Check for valid bitmap handle
	if ( hBitmap != NULL )
	{
		// Get bitmap object information
		BITMAP bitmap;
		GetObject(hBitmap, sizeof(BITMAP), &bitmap);
		DWORD dwSize = bitmap.bmHeight * bitmap.bmWidthBytes;
		int bitsPixel = bitmap.bmBitsPixel / 8;

		// Check bitmap color depth (only 24 or 32 bits per pixel allowed)
		if ( ( bitsPixel == 3 ) || ( bitsPixel == 4 ) )
		{
			// Get bitmap bits
			unsigned char* pBits = new unsigned char[dwSize];
			GetBitmapBits(hBitmap, dwSize, pBits);

			// Create region from bitmap
			unsigned char red, green, blue;
			for ( int y=0; y<bitmap.bmHeight; y++ )
			{
				for ( int x=0; x<bitmap.bmWidth; x++ )
				{
					// Get pixel color
					blue = pBits[y*bitmap.bmWidthBytes + bitsPixel*x];
					green = pBits[y*bitmap.bmWidthBytes + bitsPixel*x+1];
					red = pBits[y*bitmap.bmWidthBytes + bitsPixel*x+2];

					// Check transparent color
					if(x==1 && y==1 && RGB(red,green,blue)== transparentColor)
                        SetWindowText(ActivatedForm,"match transparent");
					if ( RGB(red,green,blue) != transparentColor )
					{
						// Combine regions
						if ( hRgn == NULL )
							hRgn = CreateRectRgn(x, y, x+1, y+1);
						else
						{
							// Delete temporary region
							if ( hRgn1 != NULL )
								DeleteObject(hRgn1);

							// Create temporary region
							hRgn1 = CreateRectRgn(x, y, x+1, y+1);

							// Combine regions
							CombineRgn(hRgn, hRgn, hRgn1, RGN_OR);
						}
					}
				}
			}

			// Free bitmap bits
			delete pBits;
		}
	}

	// Delete temporary region
	if ( hRgn1 != NULL )
		DeleteObject(hRgn1);

	return hRgn;
}

heres how i use it on WM_PAINT:

if(inst->blnTransparent==true)
                {
                    SetWindowRgn( inst->hwnd,NULL,TRUE);
                    BitBlt(test.hdc,0,0,test.rcPaint.right,test.rcPaint.bottom,imglabel,0,0,SRCCOPY);
                    SetWindowRgn( inst->hwnd, CreateRegionFromBitmap(imglabel,inst->clrBackColor),TRUE);

                }

imglable: is my image class that can return HBITMAP.
test: is the PAINTSTRUCT object.
inst: is my control object pointer(my controls are subclassed).

the control isn't shaped and i don't understand why :(
can anyone advice me?