Event of selection moving

what is the name of the event, where is it handled by default when I select two connected shape and I try to move them. So basically this:

I am asking this because I created a custom shape based on your custom shape example and selecting a custom shape a regular shape and a connection between them and try to move these constellation doesn’t work. No browser error, but it doesnt work.
In your custom shape example this also doesnt work.

In the custom elements example moving mixtures of custom elements and other elements is disallowed by CustomRules. You can adjust these rules to your needs.