navigating cleanly between main- and sub-stacks

[Nicolas Cueto]

Hello,

I have a mainstack that becomes hidden, returns to its first card, and
then opens up a substack. I want the user to not see that return to
the first card, but rather just the illusion of the substack appearing
immediately after the mainstack becomes invisible.

As it's set up now, though, for a brief moment the mainstack's return
to that first card happens on-screen, after which (or is it at the
same time?) the substack appears. I guess the problem is how I've
ordered the "open stack", "hide stack", and "go to card x (of
mainstack)" handlers.

If someone understands what I'm after here, how do I create this illusion?

Thanks.

--
Nicolas Cueto