This post belongs in the SDK forum.

@cleverbeans said: I believe g3.parent.instances[0] gives you the correct group. Not if the group has instances, which it may have after copying a group and not editing it.

The @source_entity was the key. No echo! And get_attribute should only read values and not mess the dictionary.

You change [or add] the appropriate attribute[s] for the dynamic_component and then force it to refresh thus... assuming the dynamic_componentis referenced by 'dc' and you know the 'key'/'value' wanted... dc.definition.set_attribute("dynamic_attributes", 'key', 'value') $dc_observers.get_latest_class.redraw_with_undo(dc)