iPhone pushViewController different instances of the same class

my problem is the following: I have a NavigationController that contains the whole app and I want to push two instances of the same UIViewController subclass, however when I call pushViewController, nothing happens开发者_开发百科. Is this behavior supported or? I use a class, that takes its arguments with the -init method and populates a UITableView programmatically based on this info.

The reason I want two instances of the same class is that I need the back button to work as expected.

The class is basically a custom UITableView that loads its content after performing an XPath query through an XML.

I will provide more information if requested.

There should be nothing special about pushing two distinct instances of the same VC, so long as they are, in fact, distinct instances with no UI-related objects shared between them. (Obviously, sharing data sources, etc, is not a problem.)