visibility-notify-event query

 i asked the question in gtk +general but no response so i am asking it here   

 i have a question regarding visibility-notify-event
If i add widgets to a container than i get the signal
visibility-notify-event, whenever visibility changes
but if i add widgets to a scrolledwindow i donot get visibility-notify-event
for the widgets that have
scrolled up ie not visible nor i get unmap signal.

What should i look for in order to get any of the two signals or anything
else for the widgets in scrolled window that have either scrolled up or down
which could tell me about there visibility.

thanks and regards
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