diff --git a/CMakeLists.txt b/CMakeLists.txt
index f303be4e..262af94f 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -6,6 +6,7 @@ cmake_minimum_required(VERSION 2.8.11)
 # - uname -s for more refined OS control
 # 	- Haiku for haiku
 # - debian DESTDIR? https://github.com/andlabs/libui/pull/10
+# - libui-combined* needs to be deleted so that custom command can run every time
 
 # the docs say we need to set this up prior to project()
 set(CMAKE_OSX_DEPLOYMENT_TARGET "10.8")
diff --git a/test/page4.c b/test/page4.c
index 00bc16ec..5a448c44 100644
--- a/test/page4.c
+++ b/test/page4.c
@@ -58,6 +58,23 @@ static void onECBChanged(uiEditableCombobox *c, void *data)
 	uiFreeText(t);
 }
 
+static void onRBSelected(uiRadioButtons *r, void *data)
+{
+	printf("radio buttons %d\n", uiRadioButtonsSelected(r));
+}
+
+static void selectSecond(uiButton *b, void *data)
+{
+	// TODO combobox, editable
+	uiRadioButtonsSetSelected(rb, 1);
+}
+
+static void selectNone(uiButton *b, void *data)
+{
+	// TODO combobox, editable
+	uiRadioButtonsSetSelected(rb, -1);
+}
+
 uiBox *makePage4(void)
 {
 	uiBox *page4;
@@ -123,12 +140,19 @@ uiBox *makePage4(void)
 	uiRadioButtonsAppend(rb, "Item 1");
 	uiRadioButtonsAppend(rb, "Item 2");
 	uiRadioButtonsAppend(rb, "Item 3");
+	uiRadioButtonsOnSelected(rb, onRBSelected, NULL);
 	uiBoxAppend(page4, uiControl(rb), 0);
 
 	hbox = newHorizontalBox();
 	b = uiNewButton("Append");
 	uiButtonOnClicked(b, appendCBRB, NULL);
 	uiBoxAppend(hbox, uiControl(b), 0);
+	b = uiNewButton("Second");
+	uiButtonOnClicked(b, selectSecond, NULL);
+	uiBoxAppend(hbox, uiControl(b), 0);
+	b = uiNewButton("None");
+	uiButtonOnClicked(b, selectNone, NULL);
+	uiBoxAppend(hbox, uiControl(b), 0);
 	uiBoxAppend(page4, uiControl(hbox), 0);
 
 	uiBoxAppend(page4, uiControl(uiNewHorizontalSeparator()), 0);
diff --git a/ui.h b/ui.h
index aede021b..d3996cb7 100644
--- a/ui.h
+++ b/ui.h
@@ -213,6 +213,9 @@ _UI_EXTERN uiEditableCombobox *uiNewEditableCombobox(void);
 typedef struct uiRadioButtons uiRadioButtons;
 #define uiRadioButtons(this) ((uiRadioButtons *) (this))
 _UI_EXTERN void uiRadioButtonsAppend(uiRadioButtons *r, const char *text);
+_UI_EXTERN intmax_t uiRadioButtonsSelected(uiRadioButtons *r);
+_UI_EXTERN void uiRadioButtonsSetSelected(uiRadioButtons *r, intmax_t n);
+_UI_EXTERN void uiRadioButtonsOnSelected(uiRadioButtons *r, void (*f)(uiRadioButtons *, void *), void *data);
 _UI_EXTERN uiRadioButtons *uiNewRadioButtons(void);
 
 typedef struct uiDateTimePicker uiDateTimePicker;
diff --git a/unix/radiobuttons.c b/unix/radiobuttons.c
index 7956f5f6..24bc80b1 100644
--- a/unix/radiobuttons.c
+++ b/unix/radiobuttons.c
@@ -9,10 +9,31 @@ struct uiRadioButtons {
 	GtkContainer *container;
 	GtkBox *box;
 	GPtrArray *buttons;
+	void (*onSelected)(uiRadioButtons *, void *);
+	void *onSelectedData;
+	gboolean changing;
 };
 
 uiUnixControlAllDefaultsExceptDestroy(uiRadioButtons)
 
+static void defaultOnSelected(uiRadioButtons *r, void *data)
+{
+	// do nothing
+}
+
+static void onToggled(GtkToggleButton *tb, gpointer data)
+{
+	uiRadioButtons *r = uiRadioButtons(data);
+
+	// only care if a button is selected
+	if (!gtk_toggle_button_get_active(tb))
+		return;
+	// ignore programmatic changes
+	if (r->changing)
+		return;
+	(*(r->onSelected))(r, r->onSelectedData);
+}
+
 static void uiRadioButtonsDestroy(uiControl *c)
 {
 	uiRadioButtons *r = uiRadioButtons(c);
@@ -37,11 +58,50 @@ void uiRadioButtonsAppend(uiRadioButtons *r, const char *text)
 	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);
+	g_signal_connect(rb, "toggled", G_CALLBACK(onToggled), r);
 	gtk_container_add(r->container, rb);
 	g_ptr_array_add(r->buttons, rb);
 	gtk_widget_show(rb);
 }
 
+intmax_t uiRadioButtonsSelected(uiRadioButtons *r)
+{
+	GtkToggleButton *tb;
+	guint i;
+
+	for (i = 0; i < r->buttons->len; i++) {
+		tb = GTK_TOGGLE_BUTTON(g_ptr_array_index(r->buttons, i));
+		if (gtk_toggle_button_get_active(tb))
+			return i;
+	}
+	return -1;
+}
+
+void uiRadioButtonsSetSelected(uiRadioButtons *r, intmax_t n)
+{
+	GtkToggleButton *tb;
+	gboolean active = TRUE;
+
+	// TODO this doesn't work
+	if (n == -1) {
+		n = uiRadioButtonsSelected(r);
+		if (n == -1)		// no selection; keep it that way
+			return;
+		active = FALSE;
+	}
+	tb = GTK_TOGGLE_BUTTON(g_ptr_array_index(r->buttons, n));
+	// this is easier than remembering all the signals
+	r->changing = TRUE;
+	gtk_toggle_button_set_active(tb, active);
+	r->changing = FALSE;
+}
+
+void uiRadioButtonsOnSelected(uiRadioButtons *r, void (*f)(uiRadioButtons *, void *), void *data)
+{
+	r->onSelected = f;
+	r->onSelectedData = data;
+}
+
 uiRadioButtons *uiNewRadioButtons(void)
 {
 	uiRadioButtons *r;
@@ -54,5 +114,7 @@ uiRadioButtons *uiNewRadioButtons(void)
 
 	r->buttons = g_ptr_array_new();
 
+	uiRadioButtonsOnSelected(r, defaultOnSelected, NULL);
+
 	return r;
 }