Issue with jsonp

I'm trying to get data from a service that returns it wrapped in a function but it doesn't seem to be working and I'm not sure why. I can see the data coming back fine, but then nothing else happens. Is there something else I need to do? Here's my setup:

1.  Cat = can.Model({
       findAll: 'GET  caturl',
       dataType: 'jsonp'
     }, {});
   

1. Catlist = can.Control({
       init: function() {
           this.element.html(can.view('images/js/mn/temps/catlist.ejs', {
             catdata: this.options.catdata.cats
           }));
         }
     });
   

1. Cat.findAll({}, function(catResponse) {
           new Catlist('.mn_cats', {
             catdata: catResponse
           });
         });

The json file looks something like this:

1. callBack(
2. {
     "cats": [
          {
           "name": "Sports & Recreation ",
           "id": "",
           "searchName": "",
           "children": [
             {
               "name": "Exercise & Fitness",
               "id": "61",
               "searchName": "Exercise-Fitness"
             },
             {
               "name": "Sports & Outdoors",
               "id": "21",
               "searchName": "Sports-Outdoors"
             },
             {
               "name": "Toys & Games",
               "id": "34",
               "searchName": "Toys-Hobbies"
             }
           ]
         },
          {
           "name": "Travel ",
           "id": "",
           "searchName": "",
           "children": [
             {
               "name": "Car Rentals",
               "id": "66",
               "searchName": "Car-Rentals"
             },
             {
               "name": "Cruises",
               "id": "48",
               "searchName": "Cruises"
             },
             {
               "name": "Flights",
               "id": "64",
               "searchName": "Flights"
             },
             {
               "name": "Food & Dining",
               "id": "42",
               "searchName": "Food-Dining"
             },
             {
               "name": "Hotels & Accommodations",
               "id": "53",
               "searchName": "Hotels-Accommodations"
             },
             {
               "name": "Travel Accessories",
               "id": "24",
               "searchName": "Travel Accessories"
             },
             {
               "name": "Vacation Packages",
               "id": "58",
               "searchName": "Vacation-Packages"
             }
           ]
         }
     ]
   }

This works fine without the callback.