runat=server on HTC defined tag.

[Giscard]

Is there a way to access an HTC defined tag as an HTMLControl.

I want to set an attribute on the tag from the server.

<myNamespace:myTagName runat="server"> will throws an error.

so my only option to populate that attribute is to do a lame

<myNamespace:myTagName <%=methodThatPopulatesAttribute();%>>

Anyone know a way around this? Please keep in mind that I do not have
a runat="server" on my form tag and I do not want one.

Thanks in advance.