HomeViewModel.cs

using System.Windows.Input;
using Cirrious.MvvmCross.Commands;
using Cirrious.MvvmCross.Platform.Diagnostics;

namespace Casino.Core.ViewModels
{
    public class HomeViewModel : BaseViewModel
    {
        public void Init()
        {
            MvxTrace.Trace("Initialising HomeViewModel ... with no parameters");
        }

        public ICommand GoCommand
        {
            get
            {
                return new MvxRelayCommand(() => this.RequestNavigate<SubViewModel>(new SubViewModel.NavigationParameters() { Test1 = "Testing 1", Test2 = 99 }));
            }
        }
    }
}

SubViewModel.cs

using Cirrious.MvvmCross.Platform.Diagnostics;

namespace Casino.Core.ViewModels
{
    public class SubViewModel : BaseViewModel
    {
        public class NavigationParameters : NavigationParametersBase
        {
            public string Test1 { get; set; }
            public int Test2 { get; set; }
        }

        public SubViewModel()
        {
            MvxTrace.Trace("Constructing...");
        }

        public void Init(NavigationParameters parameters)
        {
            MvxTrace.Trace("Initialising SubViewModel ... with parameters {0} and {1}", parameters.Test1, parameters.Test2);
        }
    }
}