title: registry.byID set content returns Unable to get property 'set' of undefined or null reference
body: <p>Trying to set the content of content pane with registry.byId, but I'm not able to get the object -- I get the following error:</p>
  
  <p>JavaScript runtime error: Unable to get property 'set' of undefined or null reference</p>
  
  <p>my code is like this:</p>
  
  <pre><code> require(["dojo/parser", "dojo/dom", "dijit/registry", 
  "dojox/layout/ContentPane", "dojo/domReady!"],
   function (parser, dom, registry) {
  
  parser.parse();
  
  registry.byId("Content").set("content", "Test Content");//Content ID is not being found
  
   });
  
  &lt;/script&gt;
  &lt;div data-dojo-type="dijit/layout/BorderContainer" id="Main" style="width: 100%; height: 100%"&gt;
   &lt;div data-dojo-type="dojox/layout/ContentPane" id="TOC" data-dojo-props="splitter: true, region:'leading'"&gt;
   TOC
   &lt;/div&gt;
   &lt;div data-dojo-type="dojox/layout/ContentPane" id="Content" data-dojo-props="splitter: true, region:'center'"&gt;
   &lt;/div&gt; 
  </code></pre>
  
  <p></p>
  
  <p>Any ideas?  Thanks!</p>