[iPhone SDK] UITabBarController popsToRootOnButtonPress - pop to an index?

---WARNING: long-ish description ahead!---
Hey everyone, the UITabBarController's 'popsToRootOnButtonPress' property makes it so that when you touch the tabBar item, if that item's viewcontroller is a navigationController, it "auto pops" to the root view.
This is to simulate behavior like in the Contacts app. It seems to work as advertised.
However, IF you have multiple contact groups, you'll notice a "Groups" button on the Contacts tab view. Now:
1) Go to the contacts tab
2) observe that you have a "groups" on the top left
3) tap a contact to drill down a view
4) tap the contacts tabbaritem to "auto pop"
Notice now that it actually pops to the contacts tab view, NOT the groups view, even though the groups view is the root.
Anyone figure out how to do this? My guess is that they are somehow manipulating the view controller stack to fool it to thinking that the Contacts view is the root. The reason I say that (instead of saying that it's off a different SDK), is because notice how when you are "auto popping" back, the "Groups" button doesn't slide in, it "pops" into view as it is sliding back to Contacts.
Apologies if i've made this long winded. Basically I'd like to have similar functionality where in one of my views, I need to have the "auto pop" to go to rootView + 1.
Thanks in advance,
Riz

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