Ti.UI.SearchBar, NavigationWindow and Titanium

I noticed in some iOS apps (eg Twitter) the Titanium.UI.iOS.NavigationWindow contains a Ti.UI.SearchBar. I couldn't figure out how they could add it there and even how they did the textfield animation.

So, the first question is: how to insert the Ti.UI.SearchBar inside the NavigationWindow? Can Titanium do this? My hypothesis is that they don't insert the Ti.UI.SearchBar inside the NavigationWindow but, instead, they open a new window containing a SearchBar and a tableview.

The second question (if you have the iOS Twitter app...) is how they animate the textfield of the Ti.UI.SearchBar and how to do this.

Thanks in advance!