call model subsystem creat command add undo manag param command command result command argouml model model command creation observ execut model command object execut model command command set save enabl command wrap command command model command model command command undo model command undo undoabl model command undoabl redoabl model command redoabl object execut model command execut model command project current project current project undo manag execut wrap command wrap command execut 