Open form on the active 'tab'

I use the 'Tabs' extension for Joomla.

On one of my 'tabs' I use a ChronoForms multi page form.
How do I manage it to open the next page of my form in the same 'tab' as the first page?

Hi geertmartens,

Sorry, I have no idea how to do this :-(

Bob

I found on how to do this if you use a one page Chronoforms form and a 'Show thanks message'.
In that case it is done by filling in the 'class' name in the configure page of the 'Submit' button. You can fill in the name of the tab that has to be active. The 'Thanks message' is shown neatly on the 'active' tab.

But when you use a multipage Chronoforms form this doesn't work.