title: Required Date Time Picker has always "aria-invalid=false"
body: <p>I'm not sure if I am missing out a very simple thing. Normally, XPages maintain "aria-required" and "aria-invalid" attributes for validation.</p>
  
  <p>However, for DateTime Picker (standard one), it's always <code>aria-invalid="false"</code>.</p>
  
  <p>Here is a simple test I have used in Domino 9.0.1:</p>
  
  <pre><code>&lt;?xml version="1.0" encoding="UTF-8"?&gt;
  &lt;xp:view xmlns:xp="http://www.ibm.com/xsp/core"&gt;
      &lt;xp:this.data&gt;
          &lt;xp:dominoDocument var="document1" formName="TestForm"&gt;&lt;/xp:dominoDocument&gt;
      &lt;/xp:this.data&gt;
  
      &lt;xp:button value="Label" id="button1"&gt;
          &lt;xp:eventHandler event="onclick" submit="true"
              refreshMode="partial" refreshId="panel1"&gt;
          &lt;/xp:eventHandler&gt;
      &lt;/xp:button&gt;
  
      &lt;xp:panel id="panel1"&gt;
          &lt;xp:inputText id="inputText1" required="true"&gt;
              &lt;xp:dateTimeHelper id="dateTimeHelper1"&gt;&lt;/xp:dateTimeHelper&gt;
              &lt;xp:this.converter&gt;
                  &lt;xp:convertDateTime type="date"&gt;&lt;/xp:convertDateTime&gt;
              &lt;/xp:this.converter&gt;
          &lt;/xp:inputText&gt;
          &lt;xp:messages id="messages1"&gt;&lt;/xp:messages&gt;
      &lt;/xp:panel&gt;
  &lt;/xp:view&gt;
  </code></pre>
  
  <p>Generated HTML before the button clicked contains:</p>
  
  <pre><code>&lt;input type="text" aria-haspopup="true" role="textbox" data-dojo-attach-point="textbox,focusNode" autocomplete="off" class="dijitReset dijitInputInner" aria-invalid="false" tabindex="0" aria-required="true" id="view:_id1:inputText1" value=""&gt;
  </code></pre>
  
  <p>After clicking, I can see Messages component has been aggregated but aria-invalid is false.</p>
  
  <pre><code>&lt;input type="text" aria-haspopup="true" role="textbox" data-dojo-attach-point="textbox,focusNode" autocomplete="off" class="dijitReset dijitInputInner" aria-invalid="false" tabindex="0" aria-required="true" id="view:_id1:inputText1" value=""&gt;
  </code></pre>
  
  <p><em>(I removed dojo stuff wrapping the input)</em></p>