gdk_draw_point failing ?

[manu aradhya <manu_aradhya yahoo co in>]

hi all, following code is giving 
 assertion `GDK_IS_DRAWABLE (drawable)' failed
can anybody tell me whts the problem with the 
gdk_draw_point ();
              thax for ur help.

GtkWidget *da;
da = gtk_drawing_area_new ();
gtk_drawing_area_size (GTK_DRAWING_AREA (da), 50, 50);
gtk_container_add (GTK_CONTAINER (window), da);
gtk_realize_widget (da);
gdk_draw_point (da->window, da->style->black_gc, 10,
10);



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