title: If I use "FindControl" outside a UserControl, what do I use within a UserControl?
body: <p>Suppose I have javascript within ASP.NET UserControl:</p>
  
  <pre><code>function setValue(DataItem) {
      var selectedDate = DataItem.getMember('DomainNameKey').get_object();
      Picker1.setSelectedDate(selectedDate);
  }
  </code></pre>
  
  <p>Where Picker1 is also inside the control.  Because Picker1's ID will be renamed at runtime,   what do I put in the code below to make it work within a UserControl?</p>
  
  <pre><code>function setValue(DataItem) {
      var selectedDate = DataItem.getMember('DomainNameKey').get_object();
      &lt;%= ?????????????? %&gt;.setSelectedDate(selectedDate);
  }
  </code></pre>