diff --git a/redo/reredo/control.c b/redo/reredo/control.c
index a5ad99f5..bfc54612 100644
--- a/redo/reredo/control.c
+++ b/redo/reredo/control.c
@@ -30,6 +30,11 @@ void uiControlDestroy(uiControl *c)
 	uiFree(c);
 }
 
+uintptr_t uiControlHandle(uiControl *c)
+{
+	return (*(c->Handle))(c);
+}
+
 static void controlUpdateState(uiControl *);
 
 void uiControlSetParent(uiControl *c, uiControl *parent)
diff --git a/redo/reredo/darwin/box.m b/redo/reredo/darwin/box.m
index e78c8572..6ad5b485 100644
--- a/redo/reredo/darwin/box.m
+++ b/redo/reredo/darwin/box.m
@@ -28,19 +28,18 @@ uiDarwinDefineControlWithOnDestroy(
 static uiControl *childAt(uiBox *b, uintmax_t n)
 {
 	NSValue *v;
-	uiControl *c;
 
 	v = (NSValue *) [b->children objectAtIndex:n];
 	return (uiControl *) [v pointerValue];
 }
 
-static void onDestroy(uiTab *t)
+static void onDestroy(uiBox *b)
 {
 	uintmax_t i;
 	uiControl *child;
 	NSView *childView;
 
-	for (i = 0; i < [t->children count]; i++) {
+	for (i = 0; i < [b->children count]; i++) {
 		child = childAt(b, i);
 		childView = (NSView *) uiControlHandle(child);
 		[childView removeFromSuperview];
@@ -164,7 +163,7 @@ static void relayout(uiBox *b)
 		// don't space between the last control and the no-stretchy view
 		[constraint appendString:@"[noStretchyView]"];
 	[constraint appendString:@"|"];
-	addConstraints(b->view, constraint, metrics, views);
+	addConstraint(b->view, constraint, metrics, views);
 	[constraint release];
 
 	// next: assemble the views in the secondary direction
@@ -205,9 +204,9 @@ void uiBoxAppend(uiBox *b, uiControl *c, int stretchy)
 		setHuggingPri(childView, NSLayoutPriorityDefaultLow, b->primaryOrientation);
 	else
 		// TODO will default high work?
-		setHuggingPri(childView NSLayoutPriorityRequired, b->primaryOrientation);
+		setHuggingPri(childView, NSLayoutPriorityRequired, b->primaryOrientation);
 	// make sure controls don't hug their secondary direction so they fill the width of the view
-	setHuggingPri(childView, NSLayoutPriorityDefaultLow, b->secondaryOrientation)
+	setHuggingPri(childView, NSLayoutPriorityDefaultLow, b->secondaryOrientation);
 
 	uiControlSetParent(c, uiControl(b));
 	relayout(b);
@@ -231,7 +230,7 @@ int uiBoxPadded(uiBox *b)
 	return b->padded;
 }
 
-void uiBoxSetPadded(uiBox *ss, int padded)
+void uiBoxSetPadded(uiBox *b, int padded)
 {
 	b->padded = padded;
 	relayout(b);
@@ -250,21 +249,21 @@ static uiBox *finishNewBox(BOOL vertical)
 
 	b->vertical = vertical;
 	if (b->vertical) {
-		b->primaryDirString = @"V:";
-		b->secondaryDirString = @"H:";
+		b->primaryDirPrefix = @"V:";
+		b->secondaryDirPrefix = @"H:";
 		b->primaryOrientation = NSLayoutConstraintOrientationVertical;
 		b->secondaryOrientation = NSLayoutConstraintOrientationHorizontal;
 	} else {
-		b->primaryDirString = @"H:";
-		b->secondaryDirString = @"V:";
+		b->primaryDirPrefix = @"H:";
+		b->secondaryDirPrefix = @"V:";
 		b->primaryOrientation = NSLayoutConstraintOrientationHorizontal;
 		b->secondaryOrientation = NSLayoutConstraintOrientationVertical;
 	}
 
 	b->noStretchyView = [[NSView alloc] initWithFrame:NSZeroRect];
 	[b->noStretchyView setTranslatesAutoresizingMaskIntoConstraints:NO];
-	setHorzHuggingPri(b->noStretchyView, NSLayoutPriorityDefaultLow);
-	setVertHuggingPri(b->noStretchyView, NSLayoutPriorityDefaultLow);
+	setHuggingPri(b->noStretchyView, NSLayoutPriorityDefaultLow, NSLayoutConstraintOrientationHorizontal);
+	setHuggingPri(b->noStretchyView, NSLayoutPriorityDefaultLow, NSLayoutConstraintOrientationVertical);
 
 	uiDarwinFinishNewControl(b, uiBox);
 
diff --git a/redo/reredo/darwin/control.m b/redo/reredo/darwin/control.m
index da48f571..0c3703e6 100644
--- a/redo/reredo/darwin/control.m
+++ b/redo/reredo/darwin/control.m
@@ -1,6 +1,15 @@
 // 16 august 2015
 #import "uipriv_darwin.h"
 
+static uintmax_t type_uiDarwinControl = 0;
+
+uintmax_t uiTypeMenu(void)
+{
+	if (type_uiDarwinControl == 0)
+		type_uiDarwinControl = uiRegisterType("uiDarwinControl", uiControlType(), sizeof (uiDarwinControl));
+	return type_uiDarwinControl;
+}
+
 void osCommitShow(uiControl *c)
 {
 	NSView *view;
diff --git a/redo/reredo/ui.h b/redo/reredo/ui.h
index 908443d0..6ce62d22 100644
--- a/redo/reredo/ui.h
+++ b/redo/reredo/ui.h
@@ -58,6 +58,7 @@ struct uiControl {
 _UI_EXTERN uintmax_t uiControlType(void);
 #define uiControl(this) ((uiControl *) uiIsA((this), uiControlType(), 1))
 _UI_EXTERN void uiControlDestroy(uiControl *);
+_UI_EXTERN uintptr_t uiControlHandle(uiControl *);
 _UI_EXTERN void uiControlSetParent(uiControl *, uiControl *);
 _UI_EXTERN void uiControlShow(uiControl *);
 _UI_EXTERN void uiControlHide(uiControl *);
diff --git a/redo/reredo/ui_darwin.h b/redo/reredo/ui_darwin.h
index 445cf9b7..92ac04ac 100644
--- a/redo/reredo/ui_darwin.h
+++ b/redo/reredo/ui_darwin.h
@@ -7,6 +7,12 @@ This file assumes that you have imported <Cocoa/Cocoa.h> and "ui.h" beforehand.
 #ifndef __LIBUI_UI_DARWIN_H__
 #define __LIBUI_UI_DARWIN_H__
 
+typedef struct uiDarwinControl uiDarwinControl;
+struct uiDarwinControl {
+	uiControl c;
+};
+_UI_EXTERN uintmax_t uiDarwinControlType(void);
+
 // TODO document
 #define uiDarwinDefineControlWithOnDestroy(type, typefn, handlefield, onDestroy) \
 	static uintmax_t _ ## type ## Type = 0; \
@@ -24,7 +30,7 @@ This file assumes that you have imported <Cocoa/Cocoa.h> and "ui.h" beforehand.
 	} \
 	static uintptr_t _ ## type ## Handle(uiControl *c) \
 	{ \
-		return type(c)->handlefield; \
+		return (uintptr_t) (type(c)->handlefield); \
 	} \
 	static void _ ## type ## ContainerUpdateState(uiControl *c) \
 	{ \