1 /**
  2  * Null track selector.  Does not actually do anything.
  3  * @class JBrowse.View.TrackList.Null
  4  */
  5 
  6 dojo.declare( 'JBrowse.View.TrackList.Null', null, {
  7     setTracksActive: function() {},
  8     setTracksInactive: function() {},
  9     show: function() {},
 10     hide: function() {},
 11     toggle: function() {}
 12 } );
 13