diff --git a/redo/osxaltest/box.m b/redo/osxaltest/box.m
index f56468db..a4aead4c 100644
--- a/redo/osxaltest/box.m
+++ b/redo/osxaltest/box.m
@@ -52,7 +52,7 @@
 	NSMutableArray *subhorz, *subvert;
 	NSMutableArray *subhorzleft, *subhorzright;
 	NSMutableArray *subverttop, *subvertbottom;
-	uintmax_t *first;
+	__block uintmax_t *first;
 	NSUInteger i;
 	tAutoLayoutParams pp;
 	void (^buildPrimary)(NSMutableArray *in, BOOL first, BOOL last,
@@ -149,6 +149,33 @@
 		[p->vertAttachBottom addObjectsFromArray:subvertbottom];
 	}
 
+	// now constrain the lateral dimension
+	// all children of item i must be next to the first child of item i+1
+	// this is so sub-boxes are on the same "line"
+	// TODO move this declaration above
+	void (^lateral)(NSMutableArray *, BOOL, BOOL, NSMutableArray *, NSMutableArray *) = ^(NSMutableArray *out, BOOL xfirst, BOOL last, NSMutableArray *outstart, NSMutableArray *outend) {
+		NSUInteger i;
+		uintmax_t j;
+
+		for (i = 0; i < [self->children count] - 1; i++)
+			for (j = first[i]; j < first[i + 1]; j++) {
+				NSString *c1, *c2;
+				NSString *constraint;
+
+				c1 = tAutoLayoutKey(j);
+				c2 = tAutoLayoutKey(first[i + 1]);
+				constraint = [NSString stringWithFormat:@"[%@][%@]", c1, c2];
+				[out addObject:constraint];
+				[outstart addObject:[NSNumber numberWithBool:xfirst]];
+				[outend addObject:[NSNumber numberWithBool:last]];
+			}
+	};
+
+	if (self->vertical)
+		lateral(p->vert, p->vertFirst, p->vertLast, p->vertAttachTop, p->vertAttachBottom);
+	else
+		lateral(p->horz, p->horzFirst, p->horzLast, p->horzAttachLeft, p->horzAttachRight);
+
 	[subhorz release];
 	[subhorzleft release];
 	[subhorzright release];
diff --git a/redo/osxaltest/main.m b/redo/osxaltest/main.m
index a64675e0..14f295bb 100644
--- a/redo/osxaltest/main.m
+++ b/redo/osxaltest/main.m
@@ -3,7 +3,8 @@
 
 // #qo LDFLAGS: -framework Foundation -framework AppKit
 
-BOOL margined = NO;
+BOOL spaced = NO;
+BOOL firstvert = YES;
 
 @interface appDelegate : NSObject<NSApplicationDelegate>
 @end
@@ -18,23 +19,23 @@ BOOL margined = NO;
 	tSpinbox *spinbox;
 
 	mainwin = [[tWindow alloc] init];
-	[mainwin tSetMargined:margined];
+	[mainwin tSetMargined:spaced];
 
-	box = [[tBox alloc] tInitVertical:YES];
+	box = [[tBox alloc] tInitVertical:firstvert];
 
 	spinbox = [[tSpinbox alloc] init];
 	[box tAddControl:spinbox stretchy:NO];
 
 	[mainwin tSetControl:box];
 
-	hbox = [[tBox alloc] tInitVertical:NO];
+	hbox = [[tBox alloc] tInitVertical:!firstvert];
 	button = [[tButton alloc] tInitWithText:@"Button"];
 	[hbox tAddControl:button stretchy:YES];
 	button = [[tButton alloc] tInitWithText:@"Button"];
 	[hbox tAddControl:button stretchy:YES];
 	[box tAddControl:hbox stretchy:NO];
 
-	hbox = [[tBox alloc] tInitVertical:NO];
+	hbox = [[tBox alloc] tInitVertical:!firstvert];
 	button = [[tButton alloc] tInitWithText:@"Button"];
 	[hbox tAddControl:button stretchy:YES];
 	button = [[tButton alloc] tInitWithText:@"Button"];
@@ -55,7 +56,7 @@ int main(int argc, char *argv[])
 {
 	NSApplication *app;
 
-	margined = argc > 1;
+	spaced = argc > 1;
 
 	app = [NSApplication sharedApplication];
 	[app setActivationPolicy:NSApplicationActivationPolicyRegular];