[gtkmm] automatic scrolling window (scrolledwindow)

[David Kinyanjui <david i2software com>]

I'm very new in this stuff... still searching for help!
is (gtk_scrolled_window_set_vadjustment()) supposed to automatically 
scroll the window!?
Anyway, what I'm really looking for is for the screen to scroll down 
when I <tabs> past the end. Exactly
like how  the web form on the Internet works. Also, the same screen 
should scroll back up as well
when  I  <shift-tabs> back.
In other words, the window needs to scroll up and down automatically 
depending on the current location of the cursor
(or current active field).