[TxMt] Nested comments for a Coldfusion language bundle

A month or two ago I started making a Coldfusion bundle and haven't look at it since... and now I'm back doing some CF work again the highlighting is starting to piss me off, so I thought I'd ask you guys: how do I do a bundle pattern that matches nested comments?

In CFML you can have

<!--- <cfif something eq true> <!--- A nested comment ---> </cfif> --->

and the whole thing should be syntax coloured as a comment.

The basic pattern at the moment is:

{ name = 'comment.block.html'; begin = '<!---'; end = '--->'; }

any ideas how to get nesting working?

-- Tim