copi tree uml element destin locat param model implement uml model implement param sourc tree uml element copi param destin destin contain root newli copi tree uml element element copi euml model implement model implement element sourc element destin command copi clipboard copi clipboard command creat model implement edit domain sourc command past clipboard past clipboard command creat model implement edit domain destin strict compound command copi command strict compound command pessimist copi command append copi clipboard copi command append past clipboard copi command set label copi tree uml element destin copi command execut model implement model event pump root contain set hold event model implement edit domain command stack execut copi command model implement edit domain command stack recent command affect object size model implement model event pump root contain set hold event element model implement edit domain command stack recent command affect object iter model implement edit domain command stack undo model implement model event pump root contain clear held event model implement model event pump root contain set hold event 