title: leanback library : How to draw focus for items in a VerticalGridView or HorizontalGridView?
body: <p>Im playing around the leanback library , i can see for most of the RowsFragment in the leanback package, they are using either HorizontalGridView or VerticalGridView, but when I create a new HorizontalGridView, is not drawing the focus, which means i cant use my remote control to scroll to that item.</p>
  
  <p>Anyone know how to do that?</p>
  
  <p>Also I can see some of the presenters they are using ItemBridgeAdapter for their VerticalGridView or HorizontalGridView, is it related to get the  focus of the views?</p>