title: CQ5 combobox-selection get value not title
body: <p>I have a widget of</p>
  
  <pre><code>   &lt;orderBy
      jcr:primaryType="cq:Widget"
      fieldDescription="Select a property to sort results. Ordered by 'Title' as default."
      fieldLabel="Order by"
      name="./orderBy"
      type="combobox"
      xtype="selection"&gt;
      &lt;options jcr:primaryType="cq:WidgetCollection"&gt;
          &lt;title
          jcr:primaryType="nt:unstructured"
          text="Title"
          value="jcr:title"/&gt;
          &lt;author
          jcr:primaryType="nt:unstructured"
          text="Author"
          value="jcr:created"/&gt;
          &lt;modified
          jcr:primaryType="nt:unstructured"
          text="Date Modified"
          value="cq:lastModified"/&gt;
          &lt;activated
          jcr:primaryType="nt:unstructured"
          text="Activation Date"
          value="cq:lastReplicated"/&gt;
          &lt;offtime
          jcr:primaryType="nt:unstructured"
          text="Off Date"
          value="offTime"/&gt;
          &lt;owner
          jcr:primaryType="nt:unstructured"
          text="Owner"
          value="jcr:contentOwner"/&gt;
          &lt;confidentiality
          jcr:primaryType="nt:unstructured"
          text="Confidentiality"
          value="confidentialityCode"/&gt;
      &lt;/options&gt;
  &lt;/orderBy&gt;
  </code></pre>
  
  <p>When the user uses the dropdown they see the text field in the options (as expected) but when I go to fetch the selected item from the jsp I want to get the value.  Currently I am doing:</p>
  
  <pre><code>String selectedItem = (String) properties.get("dropDownSel", "");
  </code></pre>
  
  <p>What do I have to do to get the value instead of the text property?</p>