title: compositeData of custom control is undefined in beforeRenderResponse event
body: <p>When passing data to a custom control, I have always used the compositeData object to access this data from inside the control. This is working fine, except for the beforeRenderResponse event of the custom control. Take this code as an example:</p>
  
  <pre><code>&lt;xp:this.afterPageLoad&gt;&lt;![CDATA[#{javascript:getComponent("lbl0").setValue(typeof(compositeData));}]]&gt;&lt;/xp:this.afterPageLoad&gt;
  &lt;xp:this.beforeRenderResponse&gt;&lt;![CDATA[#{javascript:getComponent("lbl1").setValue(typeof(compositeData));}]]&gt;&lt;/xp:this.beforeRenderResponse&gt;
  &lt;xp:label value="" id="lbl0"/&gt;
  &lt;xp:label value="" id="lbl1"/&gt;
  </code></pre>
  
  <p>In the afterPageLoad event, the typeof of the compositeData is "com.ibm.xsp.binding.PropertyMap". Yet in the beforeRenderResponse event, the same typeof returns "undefined".</p>
  
  <p>How can I access the compositeData in the beforeRenderResponse event?</p>