diff --git a/objc_darwin.h b/objc_darwin.h
index c24dd58..083c013 100644
--- a/objc_darwin.h
+++ b/objc_darwin.h
@@ -152,7 +152,8 @@ extern id newWarningPopover(char *);
 extern void warningPopoverShow(id, id);
 
 /* spinbox_darwin.m */
-extern id newSpinboxStepper(void);
-extern id spinboxSetup(id, id, void *);
+extern id newSpinbox(void *);
+extern id spinboxTextField(id);
+extern id spinboxStepper(id);
 
 #endif
diff --git a/spinbox_darwin.go b/spinbox_darwin.go
index 2768e40..515c8e8 100644
--- a/spinbox_darwin.go
+++ b/spinbox_darwin.go
@@ -21,22 +21,26 @@ import "C"
 // - proper spacing between edit and spinner: Interface Builder isn't clear; NSDatePicker doesn't spill the beans
 
 type spinbox struct {
-	textfield		C.id
-	stepper		C.id
-	objcspinbox	C.id
+	id	C.id
 }
 
 func newSpinbox() Spinbox {
 	s := new(spinbox)
-	s.textfield = C.newTextField()
-	s.stepper = C.newSpinboxStepper()
-	s.objcspinbox = C.spinboxSetup(s.textfield, s.stepper, unsafe.Pointer(s))
+	s.id = C.newSpinbox(unsafe.Pointer(s))
 	return s
 }
 
+func (s *spinbox) textfield() C.id {
+	return C.spinboxTextField(s.id)
+}
+
+func (s *spinbox) stepper() C.id {
+	return C.spinboxStepper(s.id)
+}
+
 func (s *spinbox) setParent(p *controlParent) {
-	C.parent(s.textfield, p.id)
-	C.parent(s.stepper, p.id)
+	C.parent(s.textfield(), p.id)
+	C.parent(s.stepper(), p.id)
 }
 
 func (s *spinbox) preferredSize(d *sizing) (width, height int) {
@@ -46,8 +50,8 @@ func (s *spinbox) preferredSize(d *sizing) (width, height int) {
 
 func (s *spinbox) resize(x int, y int, width int, height int, d *sizing) {
 	// TODO
-	C.moveControl(s.textfield, C.intptr_t(x), C.intptr_t(y), C.intptr_t(width - 20), C.intptr_t(height))
-	C.moveControl(s.stepper, C.intptr_t(x + width - 15), C.intptr_t(y), C.intptr_t(15), C.intptr_t(height))
+	C.moveControl(s.textfield(), C.intptr_t(x), C.intptr_t(y), C.intptr_t(width - 20), C.intptr_t(height))
+	C.moveControl(s.stepper(), C.intptr_t(x + width - 15), C.intptr_t(y), C.intptr_t(15), C.intptr_t(height))
 }
 
 func (s *spinbox) nTabStops() int {
diff --git a/spinbox_darwin.m b/spinbox_darwin.m
index f9d6fe4..f767a76 100644
--- a/spinbox_darwin.m
+++ b/spinbox_darwin.m
@@ -4,37 +4,58 @@
 #include "_cgo_export.h"
 #import <Cocoa/Cocoa.h>
 
+#define togoSpinbox(x) ((goSpinbox *) (x))
+
 @interface goSpinbox : NSObject {
 @public
 	void *gospinbox;
+	NSTextField *textfield;
+	NSNumberFormatter *formatter;
+	NSStepper *stepper;
 }
 @property NSInteger integerValue;
+@property NSInteger minimum;
+@property NSInteger maximum;
 @end
 
 @implementation goSpinbox
 @synthesize integerValue;
+@synthesize minimum;
+@synthesize maximum;
 @end
 
-id newSpinboxStepper(void)
+id newSpinbox(void *gospinbox)
 {
-	NSStepper *s;
+	goSpinbox *s;
+
+	s = [goSpinbox new];
+	s->gospinbox = gospinbox;
+	s->textfield = (NSTextField *) newTextField();
+	s->formatter = [NSNumberFormatter new];
+	[s->formatter setAllowsFloats:NO];
+	[s->textfield setFormatter:s->formatter];
+	s->stepper = [[NSStepper alloc] initWithFrame:NSZeroRect];
+	[s->stepper setAutorepeat:YES];		// hold mouse button to step repeatedly
+
+	[s setMinimum:0];
+	[s setMaximum:100];
+
+	[s->textfield bind:@"integerValue" toObject:s withKeyPath:@"integerValue" options:nil];
+	[s->stepper bind:@"integerValue" toObject:s withKeyPath:@"integerValue" options:nil];
+//	[s->formatter bind:@"minimum" toObject:s withKeyPath:@"minimum" options:nil];
+	[s->stepper bind:@"minValue" toObject:s withKeyPath:@"minimum" options:nil];
+//	[s->formatter bind:@"maximum" toObject:s withkeyPath:@"maximum" options:nil];
+	[s->stepper bind:@"maxValue" toObject:s withKeyPath:@"maximum" options:nil];
 
-	s = [[NSStepper alloc] initWithFrame:NSZeroRect];
-	[s setMinValue:0];
-	[s setMaxValue:100];
-	[s setIncrement:1];
-	[s setAutorepeat:YES];		// hold mouse button to step repeatedly
 	return (id) s;
 }
 
-id spinboxSetup(id textfield, id stepper, void *gospinbox)
+id spinboxTextField(id spinbox)
 {
-	goSpinbox *g;
-
-	g = [goSpinbox new];
-	g->gospinbox = gospinbox;
-	// TODO set any options?
-	[textfield bind:@"integerValue" toObject:g withKeyPath:@"integerValue" options:nil];
-	[stepper bind:@"integerValue" toObject:g withKeyPath:@"integerValue" options:nil];
-	return (id) g;
+	return (id) (togoSpinbox(spinbox)->textfield);
+}
+
+id spinboxStepper(id spinbox)
+{
+	return (id) (togoSpinbox(spinbox)->stepper);
 }