public override bool OnCreateOptionsMenu(IMenu menu)
{
MenuInflater.Inflate(Resource.Menu.main_menu_share, menu);
var shareItem = menu.FindItem(Resource.Id.action_share);
var test = MenuItemCompat.GetActionProvider(shareItem);
actionProvider = test.JavaCast<Android.Support.V7.Widget.ShareActionProvider>();
var intent = new Intent(Intent.ActionSend);
intent.SetType("text/plain");
intent.PutExtra(Intent.ExtraText, "ActionBarCompat is Awesome! Support Lib v7 #Xamarin");
actionProvider.SetShareIntent(intent);
return base.OnCreateOptionsMenu(menu);
}