/*
  * (non-Javadoc)
  *
  * @see org.eclipse.gef.commands.Command#undo()
  */
 @Override
 public void undo() {
   transformationUnit.setActivated(!status);
 }
 /*
  * (non-Javadoc)
  *
  * @see org.eclipse.gef.commands.Command#execute()
  */
 @Override
 public void execute() {
   transformationUnit.setActivated(status);
 }