Auto-resize frame

[Gregity]

If I have a frame that composed of other frames is it possible to have the outer frame adjust based upon the size of the inner frames?

Let's say I have 1 outer frame with three inner frames A, B, C. A sets relative to the parent, B relative to A, and C relative to B.

Is there a way to set the parent's bottom right to the bottom right of C? Such that if A, B, or C grow then the parent will grow?

Also, what happens in the event that one (or more) of the inner frames gets hidden?

-g