diff --git a/darwin/form.m b/darwin/form.m
index 56b1485b..eb3bb2e7 100644
--- a/darwin/form.m
+++ b/darwin/form.m
@@ -20,10 +20,6 @@
 	NSLayoutConstraint *first;
 	NSMutableArray *inBetweens;
 	NSLayoutConstraint *last;
-	NSMutableArray *widths;
-	NSMutableArray *leadings;
-	NSMutableArray *middles;
-	NSMutableArray *trailings;
 }
 - (id)initWithF:(uiForm *)ff;
 - (void)onDestroy;
@@ -65,10 +61,6 @@ struct uiForm {
 		self->nStretchy = 0;
 
 		self->inBetweens = [NSMutableArray new];
-		self->widths = [NSMutableArray new];
-		self->leadings = [NSMutableArray new];
-		self->middles = [NSMutableArray new];
-		self->trailings = [NSMutableArray new];
 	}
 	return self;
 }
@@ -79,10 +71,6 @@ struct uiForm {
 
 	[self removeOurConstraints];
 	[self->inBetweens release];
-	[self->widths release];
-	[self->leadings release];
-	[self->middles release];
-	[self->trailings release];
 
 	for (fc in self->children) {
 		[self removeConstraint:fc.baseline];
@@ -112,22 +100,6 @@ struct uiForm {
 		[self->last release];
 		self->last = nil;
 	}
-	if ([self->widths count] != 0) {
-		[self removeConstraints:self->widths];
-		[self->widths removeAllObjects];
-	}
-	if ([self->leadings count] != 0) {
-		[self removeConstraints:self->leadings];
-		[self->leadings removeAllObjects];
-	}
-	if ([self->middles count] != 0) {
-		[self removeConstraints:self->middles];
-		[self->middles removeAllObjects];
-	}
-	if ([self->trailings count] != 0) {
-		[self removeConstraints:self->trailings];
-		[self->trailings removeAllObjects];
-	}
 }
 
 - (void)syncEnableStates:(int)enabled
@@ -158,6 +130,39 @@ struct uiForm {
 		return;
 	padding = [self paddingAmount];
 
+	// first arrange the main controls vertically
+	prev = nil;
+	for (fc in self->children) {
+		if (prev == nil) {		// first control; tie to top
+			self->first = mkConstraint(self, NSLayoutAttributeTop,
+				NSLayoutRelationEqual,
+				[fc view], NSLayoutAttributeTop,
+				1, 0,
+				@"uiForm first child top constraint");
+			[self addConstraint:self->first];
+			[self->first retain];
+			prev = [fc view];
+			continue;
+		}
+		// not first; tie to previous
+		c = mkConstraint(prev, NSLayoutAttributeBottom,
+			NSLayoutRelationEqual,
+			[fc view], NSLayoutAttributeTop,
+			1, -padding,
+			@"uiForm middle vertical constraint");
+		[self addConstraint:c];
+		[self->inBetweens addObject:c];
+		prev = [fc view];
+	}
+	// and the last one
+	self->last = mkConstraint(prev, NSLayoutAttributeBottom,
+		NSLayoutRelationEqual,
+		self, NSLayoutAttributeBottom,
+		1, 0,
+		@"uiForm last child bottom constraint");
+	[self addConstraint:self->last];
+	[self->last retain];
+
 	// we don't arrange the labels vertically; that's done when we add the control since those constraints don't need to change (they just need to be at their baseline)
 }
 
@@ -237,8 +242,6 @@ struct uiForm {
 	padding = [self paddingAmount];
 	for (c in self->inBetweens)
 		[c setConstant:-padding];
-	for (c in self->middles)
-		[c setConstant:-padding];
 }
 
 - (BOOL)hugsTrailing