/**
  * Redoes the previous edit of this type.
  *
  * @exception CannotRedoException if <code>canRedo</code> returns <code>false</code>
  * @see #canRedo
  */
 public void redo() throws CannotRedoException {
   arrange.redoArrange(oViewFrame);
 }
 /**
  * Undoes the last edit operation of this type.
  *
  * @exception CannotUndoException if <code>canUndo</code> returns <code>false</code>
  * @see #canUndo
  */
 public void undo() throws CannotUndoException {
   arrange.undoArrange(oViewFrame);
 }