diff --git a/redo/unix/radiobuttons.c b/redo/unix/radiobuttons.c
index 0f792508..c57a89b0 100644
--- a/redo/unix/radiobuttons.c
+++ b/redo/unix/radiobuttons.c
@@ -6,11 +6,15 @@
 struct radiobuttons {
 	uiRadioButtons r;
 	GtkWidget *boxWidget;
+	GtkContainer *boxContainer;
 	GtkBox *box;
+	GPtrArray *buttons;
 };
 
 uiDefineControlType(uiRadioButtons, uiTypeRadioButtons, struct radiobuttons)
 
+// TODO destroy
+
 // TODO note that the handle of a uiRadioButtons is undefined (or at least highly platform-dependent and unreliable)
 static uintptr_t radiobuttonsHandle(uiControl *c)
 {
@@ -22,8 +26,16 @@ static uintptr_t radiobuttonsHandle(uiControl *c)
 static void radiobuttonsAppend(uiRadioButtons *rr, const char *text)
 {
 	struct radiobuttons *r = (struct radiobuttons *) rr;
+	GtkWidget *rb;
+	GtkRadioButton *previous;
 
-	PUT_CODE_HERE;
+	previous = NULL;
+	if (r->buttons->len > 0)
+		previous = GTK_RADIO_BUTTON(g_ptr_array_index(r->buttons, 0));
+	rb = gtk_radio_button_new_with_label_from_widget(previous, text);
+	gtk_container_add(r->boxContainer, rb);
+	g_ptr_array_add(r->buttons, rb);
+	gtk_widget_show(rb);
 	uiControlQueueResize(uiControl(r));
 }
 
@@ -34,9 +46,12 @@ uiRadioButtons *uiNewRadioButtons(void)
 	r = (struct radiobuttons *) uiNewControl(uiTypeRadioButtons());
 
 	r->boxWidget = gtk_box_new(GTK_ORIENTATION_VERTICAL, 0);
+	r->boxContainer = GTK_CONTAINER(r->boxWidget);
 	r->box = GTK_BOX(r->boxWidget);
 	uiUnixMakeSingleWidgetControl(uiControl(r), r->boxWidget);
 
+	r->buttons = g_ptr_array_new();
+
 	uiControl(r)->Handle = radiobuttonsHandle;
 
 	uiRadioButtons(r)->Append = radiobuttonsAppend;