MapPageViewModel.cs

namespace UberClone.ViewModels
{
    public class MapPageViewModel : INotifyPropertyChanged
    {
        public XUberState State { get; private set; }

        public ICommand FireTriggerCommand { get; }
        
        private readonly StateMachine<XUberState, XUberTrigger> _stateMachine;

        public MapPageViewModel()
        {
            var _stateMachine = new StateMachine<XUberState, XUberTrigger>(XUberState.Initial);
             ...
            FireTriggerCommand = new Command<XUberTrigger>((trigger) =>
            {
                if(_stateMachine.CanFire(trigger))
                {
                    _stateMachine.Fire(trigger);
                    State = _stateMachine.State;
                }
            });
        }
    }
}