An application sends a ZGM_SETBACKGROUNDBITMAP message to set a background bitmap for the ZeeGrid. The default background color must be set to color index 17 to make the background of the cells paint with a NULL_BRUSH. The user supplied bitmap is stretched to fit the background area of the ZeeGrid control.
ZGM_SETBACKGROUNDBITMAP wParam = 0; //not used; must be zero lParam = (LPARAM)hBitmap; //handle to bitmap
This message does not return a value.
The application is responsible for loading the bitmap, and destroying it upon application exit. The bitmap must remain valid for the life of the ZeeGrid using it.