6. The computer program product in accordance with claim 5 , wherein the act of determining that the model element should be changed comprises an act of detecting that a user has interfaced with the viewer with one or more gestures indicative of a user intent to perform the change.
6. The computer program product in accordance with claim 5 , wherein the act of determining that the model element should be changed comprises an act of detecting that a user has interfaced with the viewer with one or more gestures indicative of a user intent to perform the change. 9. The computer program product in accordance with claim 6 , wherein the one or more gestures is a single gesture once the model element of the first model element type is selected.