Here's my code in first-scene.html:

<div id="main" class="palm-hasheader">
     <div class="palm-header">Header</div>
      <div id="scrollerId" style="width:500px; height:500px" x-mojo-element="Scroller">
        <div>
        My Text that goes on... and on... and on... horizontally...
        </div>  
    </div>       
</div>

Here my code in first-assistant.js:

function FirstAssistant() {
    /* this is the creator function for your scene assistant object. */
}

FirstAssistant.prototype.setup = function() {
    /* this function is for setup tasks that have to happen when the scene is created */

       this.controller.setupWidget("scrollerId",
       this.attributes = {
        mode: 'horizontal'
           }
   );

};

FirstAssistant.prototype.activate = function(event) {
    /* put in event handlers here that should only be in effect when this scene is active. */
};

FirstAssistant.prototype.deactivate = function(event) {
    /* remove any event handlers you added in activate and do any other cleanup */
};

FirstAssistant.prototype.cleanup = function(event) {
    /* this function should do any cleanup needed before the scene is destroyed as 
       a result of being popped off the scene stack */
};

Can't get it to scroll horizontally. What am I missing?