How to bind Toolbar MenuItem.IsEnabled with MvvmCross and Xamarin.Android -

using mvvmcross , xamarin.android possible bind isenabled property of toolbar menuitem boolean value in viewmodel? if so, how done?

i believe it's impossible @ time bind android imenuitem.isenabled boolean value on viewmodel due fact isenabled readonly , changed enabled state of menu item requires call setisenabled(bool).

i worked around limitation adding event handler mvxviewmodel.propertychanged in activity/fragment. viewmodels inherit mvxviewmodel i'll share a way can accomplished. of app implemented fragments, example reflects that, (in actual code i've put of in base fragment class, wanted keep simple):

public class myviewmodel : mvxviewmodel {    public bool menuitemisenabled {        get{return _menuitemisenabled;}        set{setproperty(ref _menuitemisenabled, value);    } }  [mvxfragment(typeof(mainviewmodel), resource.id.content_frame, true)] [register(nameof(myfragment))] public class myfragment : mvxfragment {    private toolbar toolbar;     //menuitem enabled state should change viewmodel property    private imenuitem mymenuitem;            public new myviewmodel viewmodel     {         { return (myviewmodel)base.viewmodel; }         set { base.viewmodel = value; }     }     public override view oncreateview(layoutinflater inflater, viewgroup container, bundle savedinstancestate)     {         var view = base.oncreateview(inflater, container, savedinstancestate);          //we'll need toolbar later when set isenabled "binding"         toolbar = view.findviewbyid<toolbar>(resource.id.toolbar);          return view;     }      public override void onviewmodelset()     {         base.onviewmodelset();          viewmodel.propertychanged += viewmodel_propertychanged;     }      public override void oncreateoptionsmenu(imenu menu, menuinflater inflater)     {         base.oncreateoptionsmenu(menu, inflater);          //create menu based on menu resource         inflater.inflate(resource.menu.my_menu, menu);          //save reference menu item can update when viewmodel changes         mymenuitem = menu.finditem(resource.id.my_menu_item);          //set initial enabled state based on viewmodel         mymenuitem.setenabled(viewmodel.menuitemisenabled);     }      private void viewmodel_propertychanged(object sender, system.componentmodel.propertychangedeventargs e)     {         //when viewmodel.menuitemisenabled updated, update menuitem enabled state         if (e.propertyname == nameof(viewmodel.menuitemisenabled ))            bincontentsmenuitem?.setenabled(viewmodel.menuitemisenabled);     } } 

this should considered pseudocode, since it's trying demonstrate general concepts used work around original problem.