Data class for battle events (pages).
 public void SetPage(Troop.Page page)
 {
     this._page = page;
     this.eventTextBox.Parse(page.list);
 }
 public BattleEventPage()
 {
     this.InitializeComponent();
     this._page = new Troop.Page();
     this.comboBoxSpan.SelectedIndex = 0;
 }