Naive question #2

[nelson-gtk crynwr com]

Why is testgtk calling a gtk_curve_ function on a gtk_gamma_curve
object?  gtk_curve is a GtkCurve, derived from GtkDrawingArea, derived
from GtkWidget gtm_gamma_curve is a GtkGammaCurve, derived from
GtkVBox, derived from GtkBox, derived from GtkContainer, derived from
GtkWidget.

      curve = gtk_gamma_curve_new ();
      gtk_container_add (GTK_CONTAINER (window), curve);
      gtk_widget_show (curve);
    }

  max = 127 + (count % 2)*128;
  gtk_curve_set_range (GTK_CURVE (GTK_GAMMA_CURVE (curve)->curve),
		       0, max, 0, max);

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