xamarin android findviewbyid returns null code example

Example: android findviewbyid from item.actionView returns null

item.setActionView(R.layout.counter_action_bar_notification_icon);

        final View menu_hotlist = MenuItemCompat.getActionView(item);
        TextView ui_hot =(TextView) menu_hotlist.findViewById(R.id.hotlist_hot);
        ui_hot.setText(Integer.toString(13));