diff --git a/redo/reredo/darwin/radiobuttons.m b/redo/reredo/darwin/radiobuttons.m
index 2d3a1330..8f879f36 100644
--- a/redo/reredo/darwin/radiobuttons.m
+++ b/redo/reredo/darwin/radiobuttons.m
@@ -3,18 +3,25 @@
 
 struct uiRadioButtons {
 	uiDarwinControl c;
-	NSTextField *dummy;
+	NSMatrix *matrix;
 };
 
 uiDarwinDefineControl(
 	uiRadioButtons,						// type name
 	uiRadioButtonsType,						// type function
-	dummy								// handle
+	matrix								// handle
 )
 
+static NSButtonCell *cellAt(uiRadioButtons *r, uintmax_t n)
+{
+	return (NSButtonCell *) [r->matrix cellAtRow:n column:0];
+}
+
 void uiRadioButtonsAppend(uiRadioButtons *r, const char *text)
 {
-	// TODO
+	[r->matrix addRow];
+	[cellAt(r, [r->matrix numberOfRows] - 1) setTitle:toNSString(text)];
+	// this will definitely cause a resize in at least the vertical direction, even if not in the horizontal
 	uiDarwinControlTriggerRelayout(uiDarwinControl(r));
 }
 
@@ -24,8 +31,18 @@ uiRadioButtons *uiNewRadioButtons(void)
 
 	r = (uiRadioButtons *) uiNewControl(uiRadioButtonsType());
 
-	r->dummy = [[NSTextField alloc] initWithFrame:NSZeroRect];
-	[r->dummy setStringValue:@"TODO uiRadioButtons not implemented"];
+	r->matrix = [[NSMatrix alloc] initWithFrame:NSZeroRect];
+	[r->matrix setMode:NSRadioModeMatrix];
+	// TODO should we allow an initial state of no selection, but not allow the user to select nothing?
+	[r->matrix setAllowsEmptySelection:NO];
+	[r->matrix setIntercellSpacing:NSMakeSize(4, 2)];
+	[r->matrix setAutorecalculatesCellSize:YES];
+	[r->matrix setDrawsBackground:NO];
+	[r->matrix setDrawsCellBackground:NO];
+	[r->matrix setAutosizesCells:YES];
+	[[r->matrix prototype] setButtonType:NSRadioButton];
+	// works on NSCells too (same selector)
+	uiDarwinSetControlFont((NSControl *) [r->matrix prototype], NSRegularControlSize);
 
 	uiDarwinFinishNewControl(r, uiRadioButtons);