grid

The grid that is available to the map for display.

Places the given grid in the map view. If the given grid has already been placed in a different map, then an error occurs. If the map view already contains a grid, then the former grid is replaced by that provided. If no grid is provided (i.e. null) and the map view already contains a grid, then that grid is removed from the map view. If the map view already contains the provided grid then no change occurs.