title: ASP.NET AJAX Modal Popup Extender Responding to Server Code on Timer
body: <p>I have a modal popup extender tied to a asp:panel control that I want to show when the timer on an asp:updatepanel reloads executes the tick method.  The tick method calls another method that checks for specific conditions and if all the conditions are met, I call:</p>
  
  <pre><code>ClientScript.RegisterClientScriptBlock(this.GetType(), "key", "$find('modalPopupExtender').show();", true);
  </code></pre>
  
  <p>I have the TargetControlID on the extender control set to the asp:updatepanel.  So far this is not popping up the modal window.</p>
  
  <p>Should I have the TargetControlID set to the timer control inside of the asp:updatepanel???</p>
  
  <p>What am I missing?</p>