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Cannot get bounding box of subgraph/cluster, moving from graph to cgraph

Hello, I am trying to convert my code to use cgraph instead of graph. I am trying to get the bounding box of subgraphs, I've trierd: 

GD_width(graph), GD_height(graph) -> both come out to zero.

agget(graph, "bb") -> I get the bb of the main graph, regardless of which sub graph I pass as graph, and I would like to get just the dimensions of the sub-graph.

. agget(graph, "width") -> gives null.

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