title: Manually trigger Update Panel
body: <p>I have an UpdatePanel in the page.
  Inside this UpdatePanel, I have a control which has a button.
  Is it possible to Manually add a postback trigger for this button (which is inside the user control) in the code behind? </p>
  
  <p>Here's the sample code</p>
  
  <pre><code>//Page
  &lt;UpdatePanel&gt;
    &lt;uc1:UserControl /&gt;
  &lt;/UpdatePanel&gt;
  
  //UserControl
  &lt;textbox&gt;&lt;/textbox&gt;
  &lt;asp:button&gt;&lt;/asp:Button&gt;
  </code></pre>