title: UpdatePanel conditional mode issue when it has usercontrol inside it
body: <p>This is my markup:</p>
  
  <pre><code>&lt;asp:UpdatePanel runat="server" ID="updEml" UpdateMode="Conditional"&gt;
          &lt;ContentTemplate&gt;
              &lt;asp:LinkButton runat="server" Text="+ Add Email" ID="lnkAddEmail" OnClick="lnkAddEmail_Click" /&gt;
              &lt;div id="Emlpopup" style="width: 470px; display: none; height: 200px;"&gt;
                  &lt;uc:AddEditEmailAddress runat="server" ID="ucAdEdEml" /&gt;
              &lt;/div&gt;
          &lt;/ContentTemplate&gt;
          &lt;Triggers&gt;
              &lt;asp:AsyncPostBackTrigger ControlID="lnkAddEmail" EventName="Click" /&gt;
              &lt;asp:AsyncPostBackTrigger ControlID="btnAdEdEmail" EventName="Click" /&gt;
          &lt;/Triggers&gt;
      &lt;/asp:UpdatePanel&gt;
  </code></pre>
  
  <p>As you can see my UpdateMode is set to Conditional. I want it to be refreshed when either lnkAddEmail or  btnAdEdEmail is clicked. But problem is btnAdEdEmail is inside my UserControl and so I am getting exception </p>
  
  <blockquote>
    <p>"A control with ID 'btnAdEdEmail' could not be found for the trigger
    in UpdatePanel 'updEml'."</p>
  </blockquote>
  
  <p>. How do I get around this issue?</p>