code: function _fnCallbackFire( settings, callbackArr, event, args )
  	{
  		var ret = [];
  	
  		if ( callbackArr ) {
  			ret = $.map( settings[callbackArr].slice().reverse(), function (val, i) {
  				return val.fn.apply( settings.oInstance, args );
  			} );
  		}
  	
  		if ( event !== null ) {
  			$(settings.nTable).trigger( event+'.dt', args );
  		}
  	
  		return ret;
  	}
docs: Fire callback functions and trigger events. Note that the loop over the
  callback array store is done backwards! Further note that you do not want to
  fire off triggers in time sensitive applications (for example cell creation)
  as its slow.
  @param {object} settings dataTables settings object
  @param {string} callbackArr Name of the array storage for the callbacks in
  oSettings
  @param {string} event Name of the jQuery custom event to trigger. If null no
  trigger is fired
  @param {array} args Array of arguments to pass to the callback function /
  trigger
  @memberof DataTable#oApi