Nonumber Modal within Chronoform

Hi,

I'm using NoNumber Modal (http://www.nonumber.nl/forum/Modals/23626-Modals-inside-Chronoforms-form#23637) to display modal popups on a form (the default Joomla one doesn't scale properly). When I put in the plugin code which consists of:

{modalpop content=popupair}Tell me more{/modalpop}
				{modalcontent popupair}<h1>Air</h1><p>Expect a lot of air to be blown about through our ball blowers and balloon races whilst the guest learn about Bernoulli  and thrust.  The big pressure experiments are Air Zooka and the film canister rocket and there are always more up our sleeve.{/modalcontent}

Chronoforms strips out of the closing plugin code when it displays the form so I only get the opening tags (hence it breaks the form). Is there any way to disable the cleansing of the tags?

Just to add, this works fine in a standard Joomla article so would suggest that Chronoforms is doing something.