void gtk_scrolled_window_set_policy ( GtkScrolledWindow* scrolled_window, GtkPolicyType hscrollbar_policy, GtkPolicyType vscrollbar_policy )
Sets the scrollbar policy for the horizontal and vertical scrollbars.
The policy determines when the scrollbar should appear; it is a value
GtkPolicyType enumeration. If
scrollbar is always present; if
GTK_POLICY_NEVER, the scrollbar is
never present; if
GTK_POLICY_AUTOMATIC, the scrollbar is present only
if needed (that is, if the slider part of the bar would be smaller
than the trough — the display is larger than the page size).