How do I force subgraphs to be top-down

If I have this graph

graph TD
subgraph Backend
B
C
D
end

subgraph Front
A
end

If I link A–>B then it looks right. http://knsv.github.io/mermaid/live_editor/#/view/Z3JhcGggVEQKc3ViZ3JhcGggQmFja2VuZApCCkMKRAplbmQKCnN1YmdyYXBoIEZyb250CkEKZW5kCgpBLS0-Qg

However if I also link C–>D then subgraphs are no longer top down. http://knsv.github.io/mermaid/live_editor/#/view/Z3JhcGggVEQKc3ViZ3JhcGggQmFja2VuZApCCkMKRAplbmQKCnN1YmdyYXBoIEZyb250CkEKZW5kCgpBLS0-QgpDLS0-RA

If there any way to keep the subgraph top down?

[michucz]

I would also like to keep this issue alive. If have a couple of nodes that simply follow one another, I would like to be able to change direction, so I can start LR, than change to TB for one node, and then to RL.

[mingfang]

Thanks for reviewing this issue. I’ve read about people hacking this in different ways http://stackoverflow.com/questions/7777722/top-down-subragpraphs-left-right-inside-subgraphs e.g. create invisible nodes and links to force the top down layout.

Perhaps a less “hacky” way would be to add links to subgraphs. So in my example I can add Frontend–>Backend

And this link would cause layout to follow the graph direction, e.g. TD.