title: Get child controls on server control using javascript ASP.NET
body: <p>I've create a basic composite server control that contains a button.</p>
  
  <pre><code>&lt;Custom:Class1 ID="testClass" ClientInstanceName="test1" runat="server"&gt;&lt;/Custom:Class1&gt;
  </code></pre>
  
  <p>I would like to be able to get to the child controls using javascript for example:</p>
  
  <p>var myButton = testClass.FindControl('btnTest');</p>
  
  <p>Is there anyway to do this?</p>