rendering a user control to a string
<p>I'm using the technique described <a href="http://stackoverflow.com/questions/258877/load-a-user-control-programmatically-in-to-a-html-text-writer/259791#259791">here</a> to render a User Control to a string and it all works fine when the control contains just plain HTML, but when I try adding some server controls to the UC (like asp:button) I get the following error when calling server.execute:</p>

<blockquote>
  <p>"Error executing child request for
  handler 'System.Web.UI.Page'."</p>
</blockquote>

<p>any ideas why/how to fix it? thanks.</p>
