public MainPage() : base(false, new MainPageViewModel()) //disabled navigationbar and sets viewModel
        {
            InitializeComponent();
            //
            SetCommand("CustomCmd", CustomCmdMth);        //setter

            CallCommand("CustomCmd", false);              //you can access xaml properties while call from in ctor
            //
            SetCommand("BtnCallCommand", BtnCallFromCmd); //setter
            MvvmMessagingCenter.SubcribeIncomingEvent(this, "testMessage");
        }