code: function ( nButton, oConfig )
  	{
  		if ( oConfig !== null && oConfig.sExtends == 'collection' )
  		{
  			return;
  		}
  
  		if ( this.dom.collection.collection !== null )
  		{
  			$(this.dom.collection.collection).animate({"opacity": 0}, 500, function (e) {
  				this.style.display = "none";
  			} );
  
  			$(this.dom.collection.background).animate({"opacity": 0}, 500, function (e) {
  				this.parentNode.removeChild( this );
  			} );
  
  			this.dom.collection.collection = null;
  			this.dom.collection.background = null;
  		}
  	}
docs: Hide a button collection
  @param   {Node} nButton Button to use for the collection
  @param   {Object} oConfig Button configuration object
  @returns void
  @private