public void Back()
 {
     StateContext.GetInstance().CurrentState.Back();
 }
 public void ShowHistoryButton()
 {
     StateContext.GetInstance().CurrentState.ShowHistory();
 }
 public void ShowMainMenuButton()
 {
     StateContext.GetInstance().CurrentState.ShowMainMenu();
 }
 public void ShowCameraButton()
 {
     StateContext.GetInstance().CurrentState.CameraOff();
 }