Something I found useful when working with .NETcontrols for the Ektron CMS
application
I wanted to rendor Glyphs in design mode but DW7.01 the translators looking at
runat="server" would not render the Glyphs. Here is how I got it to render.

The files
Configuration\Translators\ASP.NET_VB\PreviewModeCu stTags.edml
Configuration\Translators\ASP.NET_Csharp\PreviewMo deCustTags.edml

Search for this line:
<searchPattern
requiredLocation="openTag"><![CDATA[/runat\s*=\s*"?server"?/i]]></searchPattern>
Add this line after it (Note it has to be after it, order is important)
<searchPattern
requiredLocation="tagName"><![CDATA[/^(?!cms:)/i]]></searchPattern>

In your case, replace csm: with aspidistra:

I'm replying because your posting help me figure this out.