title: A control with ID "" could not be found for the trigger in UpdatePanel ""
body: <p>I'm trying to use an update panel so my page doesn't refresh every time I make a click in a menu item but it seems that what i'm doing is not working out would u help me out?</p>
  
  <p>by the way this code is part of a sub-menu list, so i'm not able to change it for a button or something like that.
  this is my code:</p>
  
  <pre><code>&lt;ul id="ebul_mb73g0_2" class="ebul_mb73g0" style="display: none;"&gt;
     &lt;li&gt;            
       **&lt;asp:UpdatePanel runat="server" id="UpdatePanel2" updatemode="Conditional"&gt;
             &lt;ContentTemplate&gt;
                &lt;a title="" id="btnStock" tabindex="2" onclick="btnStock_Click"&gt;Stock&lt;/a&gt;    
             &lt;/ContentTemplate&gt;
             &lt;Triggers&gt;
                &lt;asp:AsyncPostBackTrigger ControlID="btnStock" eventname="Click" /&gt;
             &lt;/Triggers&gt;            
        &lt;/asp:UpdatePanel&gt;**
     &lt;/li&gt;             
     &lt;li&gt;&lt;a title="" id="btnSales" tabindex="3"&gt;Sales&lt;/a&gt;&lt;/li&gt;
  &lt;/ul&gt;
  </code></pre>
  
  <p>and here is the execution error i get:
  A control with ID 'btnStock' could not be found for the trigger in UpdatePanel 'UpdatePanel2'</p>
  
  <p>i believe it's because <code>&lt;a&gt;&lt;/a&gt;</code> is not a control, but is there any way i could make that work out?</p>
  
  <p>thank you for the help =)</p>