Custom cell does not update viewmodel when user enters input into cell

I am new to MVVMCross (Xamarin.iOS). So, I could be in the wrong direction. If anyone can point me in the right direction or point out what I am doing wrong.

I've already looked at the "CustomerManagement" and "Collection" MVVMCross sample.

Basically I am trying to create a settings screen.

I have one custom UITableViewCell with one textbox. See my code below. "EntryTF" - IBOutleted. The "EntryTF" is bound to the "FirstName" property of the model. The value of the FirstName parameter is reflected in the user interface. But if the user enters something in the text box, it is not saved in the model. The viewmodel / model is not updated in the short cell.

Please note that I want to keep the binding to the cell class. This way I can reuse this cell for other models or fields.

public partial class PlainEntryCell : UITableViewCell
{
    public static readonly UINib Nib = UINib.FromName ("PlainEntryCell", NSBundle.MainBundle);
    public static readonly NSString Key = new NSString ("PlainEntryCell");

    public PlainEntryCell (IntPtr handle) : base (handle)
    {
  //            this.DelayBind (() => {
 //             this.AddBindings(new Dictionary<object,string> ())
 //         });
    }

    public static PlainEntryCell Create ()
    {
        return (PlainEntryCell)Nib.Instantiate (null, null) [0];
    }

    public string CaptionText {
        get {
            return EntryTF.Text;
        }
        set {
            EntryTF.Text = value;
        }
    }
}

      

        
        
        
      

    

My view model:

public class RegisterViewModel: MvxViewModel
{
    private RegisterModel _registerModel;

    public RegisterViewModel ()
    {
        _registerModel = new RegisterModel ();
        _registerModel.FirstName = "Test";
    }

    public RegisterModel Customer {
        get { return _registerModel; }
        set {
            _registerModel = value;
            RaisePropertyChanged ("Customer");
        }
    }
}

      

        
        
        
      

    

Model:

public class RegisterModel:MvxNotifyPropertyChanged
{
    private string _firstName;

    public string FirstName {
        get { return _firstName; }
        set {
            _firstName = value;
            RaisePropertyChanged ("FirstName");
        }
    }

    public string LastName { get; set; }

    public string PhoneNum { get; set; }

    public string Email { get; set; }

    public string Pin { get; set; }
}

      

        
        
        
      

    

Source of TableView:

public class RegisterTableViewSource: MvxTableViewSource
{
    RegisterView _registerView;

    public RegisterTableViewSource (UITableView tableView, RegisterView registerView)
        : base (tableView)
    {
        _registerView = registerView;

        tableView.RegisterNibForCellReuse (PlainEntryCell.Nib,
            PlainEntryCell.Key);
        //tableView.RegisterNibForCellReuse (UINib.FromName ("DogCell", NSBundle.MainBundle), DogCellIdentifier);
    }

    protected override UITableViewCell GetOrCreateCellFor (UITableView tableView, Foundation.NSIndexPath indexPath, object item)
    {
        var cell = TableView.DequeueReusableCell (PlainEntryCell.Key, indexPath);
        cell.Bind (_registerView, "CaptionText Customer.FirstName");
        return cell;
        //return (UITableViewCell)TableView.DequeueReusableCell (PlainEntryCell.Key, indexPath);
    }

    public override nint RowsInSection (UITableView tableview, nint section)
    {
        return 2;
    }
}

      

        
        
        
      

    

Update: Still not able to get a response. In the above code, I want to bind "EntryTF" to a property of the model. But I want to keep the binding of the outer class. So the CaptionText property is not required unless someone can specify a direct way to bind to "EntryTF", Isn't there a way to create a BindableProperty just like Xamarin Forms? I feel like MVVMCross is a mature framework, so there is no solution to this kind of simple stuff.

I would also love it here if there is some simple / different way to achieve the same things.

I also looked at MTD but didn't find much useful for a custom cell and I need a good amount of training as well.