public String AddPage(String name)
        {
            if (name == null)
            {

                name = AddPage();
            }

            else
            {
                this.pages.Add(new Page(this, name));
                this.undoStack.Add(new UndoDataStructure(null, "Add"));
            }
            return name;
        }

        public String AddPage()
        {
            String pageName = "Page" + (pages.Count + 1);
            this.pages.Add(new Page(this, pageName));
            this.undoStack.Add(new UndoDataStructure(null, "Add"));
            return pageName;
        }