diff --git a/new/alloc_darwin.m b/new/alloc_darwin.m
index 48b2a12..059152a 100644
--- a/new/alloc_darwin.m
+++ b/new/alloc_darwin.m
@@ -1,12 +1,14 @@
 // 4 december 2014
 #include "ui_darwin.h"
 
+// TODO is there a better alternative to NSCAssert()? preferably a built-in allocator that panics on out of memory for us?
+
 void *uiAlloc(size_t size)
 {
 	void *out;
 
 	out = malloc(size);
-	NSAssert(out != NULL, @"out of memory in uiAlloc()");
+	NSCAssert(out != NULL, @"out of memory in uiAlloc()");
 	memset(out, 0, size);
 	return out;
 }
@@ -18,7 +20,7 @@ void *uiRealloc(void *p, size_t size)
 	if (p == NULL)
 		return uiAlloc(size);
 	out = realloc(p, size);
-	NSAssert(out != NULL, @"out of memory in uiRealloc()");
+	NSCAssert(out != NULL, @"out of memory in uiRealloc()");
 	// TODO zero the extra memory
 	return out;
 }
diff --git a/new/init_darwin.m b/new/init_darwin.m
index 86f271c..6d71152 100644
--- a/new/init_darwin.m
+++ b/new/init_darwin.m
@@ -1,5 +1,5 @@
 // 6 april 2015
-#include "ui_darwin.m"
+#include "ui_darwin.h"
 
 @interface uiApplication : NSApplication
 @end
@@ -31,6 +31,7 @@ uiInitError *uiInit(uiInitOptions *o)
 
 const char *uiInitErrorMessage(uiInitError *err)
 {
+	return "";
 }
 
 void uiInitErrorFree(uiInitError *err)
diff --git a/new/test.c b/new/test.c
index 6bd5049..400c3f8 100644
--- a/new/test.c
+++ b/new/test.c
@@ -26,5 +26,6 @@ int main(void)
 	uiWindowShow(w);
 
 	uiMain();
+	printf("after uiMain()\n");
 	return 0;
 }
diff --git a/new/ui_darwin.h b/new/ui_darwin.h
index 60826e4..159939c 100644
--- a/new/ui_darwin.h
+++ b/new/ui_darwin.h
@@ -8,6 +8,8 @@
 #import <Cocoa/Cocoa.h>
 #import "ui.h"
 
+#define toNSString(str) [NSString stringWithUTF8String:(str)]
+
 // alloc_darwin.m
 extern void *uiAlloc(size_t);
 extern void *uiRealloc(void *, size_t);
diff --git a/new/window_darwin.m b/new/window_darwin.m
index 4469690..1a60f8b 100644
--- a/new/window_darwin.m
+++ b/new/window_darwin.m
@@ -1,8 +1,9 @@
 // 6 april 2015
 #include "ui_darwin.h"
 
-@interface uiWindowDelegate : NSWindowDelegate
-@property void (*onClosing)(uiWindow *, void *);
+@interface uiWindowDelegate : NSObject <NSWindowDelegate>
+@property uiWindow *w;
+@property int (*onClosing)(uiWindow *, void *);
 @property void *onClosingData;
 @end
 
@@ -12,7 +13,7 @@
 - (BOOL)windowShouldClose:(id)win
 {
 	// return exact constants to be safe
-	if ((*(self.onClosing))(self.onClosingData))
+	if ((*(self.onClosing))(self.w, self.onClosingData))
 		return YES;
 	return NO;
 }
@@ -39,9 +40,11 @@ uiWindow *uiNewWindow(char *title, int width, int height)
 		styleMask:(NSTitledWindowMask | NSClosableWindowMask | NSMiniaturizableWindowMask | NSResizableWindowMask)
 		backing:NSBackingStoreBuffered
 		defer:YES];
+	[w->w setTitle:toNSString(title)];
 	// TODO substitutions
 
 	w->d = [uiWindowDelegate new];
+	w->d.w = w;
 	w->d.onClosing = defaultOnClosing;
 	[w->w setDelegate:w->d];
 
@@ -71,7 +74,7 @@ void uiWindowHide(uiWindow *w)
 	[w->w orderOut:w->w];
 }
 
-void uiWindowOnClosing(uiWindow *w, int (*)(uiWindow *f, void *), void *data)
+void uiWindowOnClosing(uiWindow *w, int (*f)(uiWindow *, void *), void *data)
 {
 	w->d.onClosing = f;
 	w->d.onClosingData = data;