ImageButton and ServerTags not parsing...

I have a question for you geniuses out there :)  I am trying to use the response.write server tags and it's parsing the opening tag into safe HTML.

For example:
<asp:ImageButton ID="X01btn" runat="server" ImageUrl="images/X01.gif" CausesValidation="false" OnClientClick='<%= contentBoxPnl.ClientID %>' />
 is parsing into this: <input type="image" name="X01btn" id="X01btn" src="images/X01.gif" onclick="&lt;%= contentBoxPnl.ClientID %>;" style=&q ...