Lablgtk interface to GtkCurve

Hi
I want to draw several curve using GTK+ and Lablgtk.
According to my research, the most appropriate class for this is the class
called GtkCurve (http://library.gnome.org/devel/gtk/2.16/GtkCurve.html).
However, in GTK+ documentation (cf previous link), this class is considered
"too specialized/little-used for GTK+".
Plus, according to the Lablgtk documentation, there is no interface for this
class.
Is this fact about Lablgtk linked to the current status of GtkCurve inside
the whole GTK+ ensemble (ie, the maintainers don't want to maintain an
interface for a class that will disappear from GTK+) or is this a deliberate
choice, or have I not searched enough ?
Thanks in advance for your time.
Johan Mazel

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