Revbrowser: checking for form submission

[David Bovill]

Is there any way to check whether RevBrowser is posting a form? I don;t
think there is a suitable message to trap? I want to update some GUI
elements if a user submits new information via the browser. As the forms use
http "post" not "get" I don;t think any of the normal navigate messages are
going to work?

on browserBeforeNavigate pInstanceId, pUrl
  put pUrl into field "Browser Address" of group ("Browser" && pInstanceId)
of me
end browserBeforeNavigate