COMETs: a new toolkit for the creation of plastic user interfaces. COMETs combines aspects from model-driven engineering with interactors toolkits in a component-based architecture. Instead of omitting the semantics that lead to the realization of an interactor once it is deployed, a COMET embeds this information as a semantic network of information as part of the interactor. COMETs are extensible, adaptable and controllable both at design-time and at run-time by users. The video illustrates our approach with the plastic presentation software CamNote++.