async void OnNewGame()
{
var opt = new GameOptions()
{
IsSinglePlayer = Game.GameOptions.IsSinglePlayer
};
var vm = new NewGameViewModel();
vm.Initialize(opt);
var result = await _userInterfaceService.ShowView(vm);
if (result == DialogResultEnum.Yes)
{
Game.NewGame(vm.GameOptions);
}
NotifyPropertyChanged(() => Title);
}