I thought that fb was not written in native code.
Anyway, it should be easy to get the desired results: Place a panel at the up side, containing the desired tabs (even a tabhost can do this, but it's too fixed). When the user clicks, show another panel, containing a scrollview and setting the data requested.
About the scroll feature, you can use the scrollChanged event, and then based on the scrollPosition property, decide if you want to refresh data.