Question : how to interact with controls within node ?

[Ombrelin]

Hi,
First, thanks for the great lib !
I'm working on an app with nodes which controls in them, a bit like the checkbox node in your sample. However, I can't interact with those controle for some reason I can't click them.
I looked at your code from the sample and set IsHitTestVisible="True" but with no success.
Any hint on how to fix this this ?
Thanks in advance !

(In case you're curious, my app is https://github.com/Ombrelin/five-years-plan, a helper tool for the game satisfactory)