Direction in creating a tree-like stucture as an editor widget?

I have need to create a tree-like structure (combo-trees) as an editor widget. I needed to create my combo and item systems outside the animation BPs and I want to create an editor panel for items as well as attack-trees for weapon-types.

I essentially need to recreate the state-machine type layout insofar as nodes + links. Just fishing for any tips if any are available? Anything in the widget UI I might want to look at specifically? Anyone try this before?

And to be more specific, I do not need to create a state machine specifically, just nodes/connectors that would be arrangable as such (if possible).

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