Query regarding GtkScrolledWindow

[iluvlinux <iluvubuntu gmail com>]

hi
     i have a query regarding GtkScrolledWindow

The Class Path for child widgets is like

GtkWindow.GtkVBox.GtkScrolledWindow.GtkViewport.GtkTable.GtkVBox.GtkHBox.GtkRadioButton
GtkWindow.GtkVBox.GtkScrolledWindow.GtkViewport.GtkTable.GtkVBox.GtkHBox.GtkCheckButton
....
....

there are many more child widgets (not just two as shown above)

every thing works fine when i scroll up or down the scrolled window, but
what i want is a kind of notification
for those widgets  that have been scrolled up or down when i press down or
Up arrow key or click on scroll bar. 

Is there a way to do the same, so that i can get a notification for widgets
that are scrolled up or down and are invisible.

thanks and regards
varun

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