title: trigger an async postback for an update panel from a repeater control
body: <p>I have an ASP.NET <code>Repeater</code> Control inside an <code>UpdatePanel</code>. I need to update another control when clicking in an <code>ImageButton</code> (inside of the <code>Repeater</code> template). The thing is that I can't get that to trigger.</p>
  
  <p>The panel <code>upPanelRotator</code> is refreshed... which I <strong>don't</strong> want...I just want to call back to server to update another panel - which I'll control from the server.</p>
  
  <p>Any ideas?</p>
  
  <pre><code>&lt;asp:UpdatePanel ID="upPanelRotator" runat="server" UpdateMode="Conditional"&gt;
      &lt;ContentTemplate&gt;
          &lt;asp:Repeater ID="rptRotator" runat="server" OnItemCommand="rptRotator_ItemCommand"&gt;
              &lt;ItemTemplate&gt;
                  &lt;asp:ImageButton ID='imgBtn' runat="server" /&gt;
          &lt;/asp:Repeater&gt;
      &lt;/ContentTemplate&gt;
      &lt;Triggers&gt;
          &lt;asp:AsyncPostBackTrigger ControlID="imgBtn" EventName="ItemCommand" /&gt;
      &lt;/Triggers&gt;
  &lt;/asp:UpdatePanel&gt;
  </code></pre>