GtkScrolledWindow: add_with_viewport()

[murrayc t-online de (Murray Cumming)]

In the documentation, it says

"
If a widget has native scrolling abilities, it can be added to the
GtkScrolledWindow with gtk_container_add(). If a widget does not, you
must first add the widget to a GtkViewport, then add the GtkViewport to
the scrolled window. The convenience function
gtk_scrolled_window_add_with_viewport() does exactly this, so you can
ignore the presence of the viewport.
"

Is there any way to programatically determine whether the widget "has
native scrolling abilities"?

-- 
Murray Cumming
murrayc usa net
www.murrayc.com