/**
 * Null track selector.  Does not actually do anything.
 * @class JBrowse.View.TrackList.Null
 */

dojo.declare( 'JBrowse.View.TrackList.Null', null, {} );

/**
 * Null track selector.  Does not actually do anything.
 * @class JBrowse.View.TrackList.Null
 */

dojo.declare( 'JBrowse.View.TrackList.Null', null, {
    setTracksActive: function() {},
    setTracksInactive: function() {},
    show: function() {},
    hide: function() {},
    toggle: function() {}
} );

make the Null track selector have no-ops for all the track selector API methods