Hi, in the pharo book, morphs unsubscribe to an announcer in delete for garbage-collection, but what do i do, when a morph is not explicitely deleted, but its owner? i have mypanelmorph that subscribes to an announcer. it has a tabgroupmorph as its owner, which has a panelmorph as its owner, which has a systemwindow as its owner, which has a model, that knows absolutely nothing about mypanelmorph, but occasionally deletes panelmorph. is there a method in mypanelmorph, where i could put the unsubscription in, that would be called, when panelmorph will be deleted? werner