Is this the correct way to manually adjust a range widget value?

[Rob Browning <rlb cs utexas edu>]

  GtkAdjustment *obj;
  ...
  obj->value = value;
  gtk_signal_emit(GTK_OBJECT(obj), changed_value_signal_id);

or are you supposed to modify the value, then call
gtk_range_set_adjustment?

Thanks
-- 
Rob