title: AsyncPostBackTrigger doesn't find LinkButton
body: <p>I have this code in my .aspx file</p>
  
  <p>
          </p>
  
  <pre><code>    &lt;asp:UpdatePanel runat="server" ID="UpdatePanel1" UpdateMode="Conditional"&gt;
          &lt;ContentTemplate&gt;    
              &lt;asp:PlaceHolder runat="server" ID="Placeholder1" EnableViewState="false"&gt;&lt;/asp:PlaceHolder&gt;
          &lt;/ContentTemplate&gt;
          &lt;Triggers&gt;
              &lt;asp:AsyncPostBackTrigger ControlID="ShowVotePanelBtn" EventName="ShowVoteClick" /&gt;
          &lt;/Triggers&gt;
      &lt;/asp:UpdatePanel&gt;
  </code></pre>
  
  <p>And I get this error:
  <code>Could not find an event named 'ShowVoteClick' on associated control 'ShowVotePanelBtn' for the trigger in UpdatePanel 'UpdatePanel1'</code>.</p>
  
  <p>I don't understand this message. The control has the corresponding click event.</p>
  
  <p>Any idea?</p>