View Groups Have No Properties
As QuickDraw GX objects, view groups have no directly accessible properties. A view group is more like an ID number than an object containing information. Although you can at any time obtain a list of view ports and view devices that belong to a given view group, you can think of that information as coming from the individual view port and view device objects in the group, rather than from the view group object itself.Likewise, the dimensional and positioning information imposed by a view group is all contained in the mapping matrices of the individual view ports and view devices that belong to the view group.
The only kinds of manipulation that you can perform directly on view group objects are creating them, disposing of them, and passing their references as function parameters.