gtk_widget_set_sensitive (GTK_WIDGET (vr->rw[VC_SYSMIS].rb), !vr->input_var_is_string);
gtk_widget_set_sensitive (GTK_WIDGET (vr->rw[VC_MISSING].rb), !vr->input_var_is_string);
gtk_widget_set_sensitive (GTK_WIDGET (vr->rw[VC_RANGE].rb), !vr->input_var_is_string);
gtk_widget_set_sensitive (GTK_WIDGET (vr->rw[VC_SYSMIS].rb), !vr->input_var_is_string);
gtk_widget_set_sensitive (GTK_WIDGET (vr->rw[VC_MISSING].rb), !vr->input_var_is_string);
gtk_widget_set_sensitive (GTK_WIDGET (vr->rw[VC_RANGE].rb), !vr->input_var_is_string);