The throw button is not displayed on the demo

I am running a demo from https://github.com/googlecast/CastVideos-android .

It depends on the library located here https://github.com/googlecast/CastCompanionLibrary-android

The project is set up with all the necessary libraries and the required bank.

The project compiles and does not launch any problems, except that the chromecast button does not appear in the actionBar.

A button appears if I change onCreate with the following :

mSelector = new MediaRouteSelector.Builder()
      .addControlCategory(MediaControlIntent.CATEGORY_LIVE_AUDIO)
      .addControlCategory(MediaControlIntent.CATEGORY_LIVE_VIDEO)
      .addControlCategory(MediaControlIntent.CATEGORY_REMOTE_PLAYBACK)
      .addControlCategory(CastMediaControlIntent.categoryForCast(getResources().getString(R.string.app_id))).build();

and change onCreateOptionsMenu as follows:

 @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        super.onCreateOptionsMenu(menu);
        getMenuInflater().inflate(R.menu.main, menu);

      //mediaRouteMenuItem = mCastManager.addMediaRouterButton(menu, R.id.media_route_menu_item);
      //Attach the MediaRouteSelector to the menu item

        //MenuItem 
        mediaRouteMenuItem = menu.findItem(R.id.media_route_menu_item);
        MediaRouteActionProvider mediaRouteActionProvider = (MediaRouteActionProvider)MenuItemCompat.getActionProvider(mediaRouteMenuItem);
        mediaRouteActionProvider.setRouteSelector(mSelector);
        return true;
    }

If I just left onCreateOptionsMenu since it was out of the box, then this will not work.

@Override
    public boolean onCreateOptionsMenu(Menu menu) {
        super.onCreateOptionsMenu(menu);
        getMenuInflater().inflate(R.menu.main, menu);

        mediaRouteMenuItem = mCastManager.addMediaRouterButton(menu, R.id.media_route_menu_item);        
        return true;
    }

Any ideas as to why this is?