jQuery.Controller.prototype.options  attribute     

Options is jQuery.Controller.defaults merged with the 2nd argument passed to a controller (or the first argument passed to the controller's jQuery plugin).

For example:

$.Controller("Tabs", 
{
   defaults : {
     activeClass: "ui-active-state"
   }
},
{
   init : function(){
     this.element.addClass(this.options.activeClass);
   }
})

$("#tabs1").tabs()                         // adds 'ui-active-state'
$("#tabs2").tabs({activeClass : 'active'}) // adds 'active'