title: Dojo PostCreate issue
body: <p>I have a custom widget which has a content pane (among other things). In it I have a multiselect listbox. I have a assigned a <code>dojoAttachPoint</code> to the listbox.</p>
  
  <p>I want to populate the listbox when the widget is created.</p>
  
  <p>In <code>postCreate</code> I try to fill the listbox with items, but the reference to
  <code>this.selectFrom</code> (which is the <code>dojoAttachPoint</code>) is null.</p>
  
  <p>Why would this not be available in <code>postCreate</code>? Any workarounds?</p>
  
  <p>Thanks in advance</p>
  
  <p>HTML:</p>
  
  <pre><code>&lt;div dojoType='dijit.layout.ContentPane'&gt;
    &lt;select name="drop1" style='width:200px;'
        id="selectTo" dojoAttachPoint='selectTo'
        size="10" multiple="multiple"&gt;
      &lt;option value="1"&gt;second col&lt;/option&gt;
      &lt;option value="2"&gt;option two&lt;/option&gt;
    &lt;/select&gt;
  &lt;/div&gt;
  </code></pre>
  
  <p>JS:</p>
  
  <pre><code>postCreate: function (){
    this.inherited (arguments);
    var newOption = document.createElement('option');
    text = 'Mark Brown';
    value = '1';
    selectTo.options [this.selectTo.options.length] = new Option (name,value);
  }
  </code></pre>
  
  <p><code>this.selectTo</code> is <code>null</code> and it shouldn't be.</p>
  
  <p>Thanks</p>