diff --git a/redo/container_darwin.go b/redo/container_darwin.go
index fd28b4c..1f8a477 100644
--- a/redo/container_darwin.go
+++ b/redo/container_darwin.go
@@ -10,6 +10,7 @@ import (
 import "C"
 
 type container struct {
+	// TODO rename to id
 	view		C.id
 	*sizer
 }
@@ -27,5 +28,6 @@ func newContainer(child Control) *container {
 //export containerResized
 func containerResized(data unsafe.Pointer, width C.intptr_t, height C.intptr_t) {
 	c := (*container)(unsafe.Pointer(data))
+	// the origin of a view's content area is always (0, 0)
 	c.resize(0, 0, int(width), int(height))
 }
diff --git a/redo/container_darwin.m b/redo/container_darwin.m
index 17ada72..8f1e3ac 100644
--- a/redo/container_darwin.m
+++ b/redo/container_darwin.m
@@ -5,7 +5,11 @@
 #include <Cocoa/Cocoa.h>
 
 // calling -[className] on the content views of NSWindow, NSTabItem, and NSBox all return NSView, so I'm assuming I just need to override these
-// fortunately, in the case of NSTabView, this -[setFrame:] is called when resizing and when changing tabs, so we can indeed use this directly there
+// fornunately:
+// - NSWindow resizing calls -[setFrameSize:] (but not -[setFrame:])
+// - NSTab resizing calls both -[setFrame:] and -[setFrameSIze:] on the current tab
+// - NSTab switching tabs calls both -[setFrame:] and -[setFrameSize:] on the new tab
+// so we just override setFrameSize:
 @interface goContainerView : NSView {
 @public
 	void *gocontainer;
@@ -14,11 +18,12 @@
 
 @implementation goContainerView
 
-- (void)setFrame:(NSRect)r
+- (void)setFrameSize:(NSSize)s
 {
-	[super setFrame:r];
+NSLog(@"setFrameSize %@", NSStringFromSize(s));
+	[super setFrameSize:s];
 	if (self->gocontainer != NULL)
-		containerResized(self->gocontainer, (intptr_t) r.size.width, (intptr_t) r.size.height);
+		containerResized(self->gocontainer, (intptr_t) s.width, (intptr_t) s.height);
 }
 
 @end
diff --git a/redo/objc_darwin.h b/redo/objc_darwin.h
index 28b07e4..703f757 100644
--- a/redo/objc_darwin.h
+++ b/redo/objc_darwin.h
@@ -23,6 +23,7 @@ extern void issue(void *);
 /* window_darwin.m */
 extern id newWindow(intptr_t, intptr_t);
 extern void windowSetDelegate(id, void *);
+extern void windowSetContentView(id, id);
 extern const char *windowTitle(id);
 extern void windowSetTitle(id, const char *);
 extern void windowShow(id);
diff --git a/redo/window_darwin.go b/redo/window_darwin.go
index 8393cf7..4fa847b 100644
--- a/redo/window_darwin.go
+++ b/redo/window_darwin.go
@@ -15,7 +15,7 @@ type window struct {
 
 	closing	*event
 
-	*sizer
+	*container
 }
 
 func newWindow(title string, width int, height int, control Control) *window {
@@ -26,11 +26,10 @@ func newWindow(title string, width int, height int, control Control) *window {
 	w := &window{
 		id:			id,
 		closing:		newEvent(),
-		sizer:		new(sizer),
+		container:		newContainer(control),
 	}
-	C.windowSetDelegate(id, unsafe.Pointer(w))
-	w.child = control
-	w.child.setParent(&controlParent{C.windowContentView(w.id)})
+	C.windowSetDelegate(w.id, unsafe.Pointer(w))
+	C.windowSetContentView(w.id, w.container.view)
 	return w
 }
 
@@ -69,11 +68,3 @@ func windowClosing(xw unsafe.Pointer) C.BOOL {
 	}
 	return C.NO
 }
-
-//export windowResized
-func windowResized(xw unsafe.Pointer, width C.uintptr_t, height C.uintptr_t) {
-	w := (*window)(unsafe.Pointer(xw))
-	// the origin of the window's content area is always (0, 0)
-	w.resize(0, 0, int(width), int(height))
-	fmt.Printf("new size %d x %d\n", width, height)
-}
diff --git a/redo/window_darwin.m b/redo/window_darwin.m
index 9a02862..f0930f8 100644
--- a/redo/window_darwin.m
+++ b/redo/window_darwin.m
@@ -5,6 +5,7 @@
 #import <Cocoa/Cocoa.h>
 
 #define toNSWindow(x) ((NSWindow *) (x))
+#define toNSView(x) ((NSView *) (x))
 
 @interface goWindowDelegate : NSObject <NSWindowDelegate> {
 @public
@@ -19,11 +20,6 @@
 	return windowClosing(self->gowin);
 }
 
-- (void)windowDidResize:(NSNotification *)n
-{
-	[self doWindowResize:[n object]];
-}
-
 - (void)doWindowResize:(id)win
 {
 	NSWindow *w;
@@ -69,6 +65,11 @@ void windowSetDelegate(id win, void *w)
 	[toNSWindow(win) setDelegate:d];
 }
 
+void windowSetContentView(id win, id view)
+{
+	[toNSWindow(win) setContentView:toNSView(view)];
+}
+
 const char *windowTitle(id win)
 {
 	return [[toNSWindow(win) title] UTF8String];