Jay Martin

Note, this is in PyCharm - not sure if that makes a difference.

Is this bug referring to the following? These are components from [SvelteUI](https://github.com/svelteuidev/svelteui) (which work correctly despite the red error indications): 

Sorry, too long ago, I don't recall.

I'm trying to make that work now, but I think the nested nature of tree-node may be a problem. Still working on it though.