adamped

<Button Command="{Binding LoginCommand}" Text="Login" />

        private RelayCommand _loginCommand;
        public RelayCommand LoginCommand
        {
            get
            {
                return _loginCommand
                       ?? (_loginCommand = new RelayCommand(
                           async () =>

adamped

// Pass parameter to view model 
var model = page.BindingContext as BaseViewModel; 
if (model != null) 
    await model.OnNavigated(parameter); 

adamped

using Definition.Interfaces;
using Mobile.ViewModel;
using System;
using System.Collections.Generic;
using System.Linq;
using System.Text;
using System.Threading.Tasks;
using Xamarin.Forms;

namespace Mobile.View