diff --git a/redo/reredo/darwin/combobox.m b/redo/reredo/darwin/combobox.m
index cff6f2bf..ca427ede 100644
--- a/redo/reredo/darwin/combobox.m
+++ b/redo/reredo/darwin/combobox.m
@@ -1,26 +1,42 @@
 // 14 august 2015
 #include "uipriv_darwin.h"
 
+// TODOs:
+// - 10.8: edges of NSPopUpButton clipped
+
 struct uiCombobox {
 	uiDarwinControl c;
 	BOOL editable;
 	NSPopUpButton *pb;
+	NSArrayController *pbac;
 	NSComboBox *cb;
 	NSObject *handle;				// for uiControlHandle()
 };
 
-uiDarwinDefineControl(
+static void onDestroy(uiCombobox *);
+
+uiDarwinDefineControlWithOnDestroy(
 	uiCombobox,							// type name
 	uiComboboxType,						// type function
-	handle								// handle
+	handle,								// handle
+	onDestroy(this);						// on destroy
 )
 
+static void onDestroy(uiCombobox *c)
+{
+	if (!c->editable) {
+		[c->pb unbind:@"contentObjects"];
+		[c->pb unbind:@"selectedIndex"];
+		[c->pbac release];
+	}
+}
+
 void uiComboboxAppend(uiCombobox *c, const char *text)
 {
 	if (c->editable)
 		[c->cb addItemWithObjectValue:toNSString(text)];
 	else
-		[c->pb addItemWithTitle:toNSString(text)];
+		[c->pbac addObject:toNSString(text)];
 }
 
 static uiCombobox *finishNewCombobox(BOOL editable)
@@ -46,6 +62,23 @@ static uiCombobox *finishNewCombobox(BOOL editable)
 		[pbcell setArrowPosition:NSPopUpArrowAtBottom];
 		// TODO font
 		c->handle = c->pb;
+
+		// NSPopUpButton doesn't work like a combobox
+		// - it automatically selects the first item
+		// - it doesn't support duplicates
+		// but we can use a NSArrayController and Cocoa bindings to bypass these restrictions
+		c->pbac = [NSArrayController new];
+		[c->pbac setAvoidsEmptySelection:NO];
+		[c->pbac setSelectsInsertedObjects:NO];
+		[c->pbac setAutomaticallyRearrangesObjects:NO];
+		[c->pb bind:@"contentValues"
+			toObject:c->pbac
+			withKeyPath:@"arrangedObjects"
+			options:nil];
+		[c->pb bind:@"selectedIndex"
+			toObject:c->pbac
+			withKeyPath:@"selectionIndex"
+			options:nil];
 	}
 
 	uiDarwinFinishNewControl(c, uiCombobox);