Added dual window classes.

Application/DualWindow.h

@@ -0,0 +1,21 @@
+//
+//  InvertedToolbarWindow.h
+//  Cog
+//
+//  Created by Vincent Spader on 10/31/07.
+//  Copyright 2007 __MyCompanyName__. All rights reserved.
+//
+
+#import <Cocoa/Cocoa.h>
+
+
+@interface DualWindow : NSWindow {
+	IBOutlet DualWindow *otherWindow;
+}
+
+- (void)showWindow;
+
+- (BOOL)isHidden;
+- (void)setHidden:(BOOL)h;
+
+@end

Application/DualWindow.m

@@ -0,0 +1,55 @@
+//
+//  InvertedToolbarWindow.m
+//  Cog
+//
+//  Created by Vincent Spader on 10/31/07.
+//  Copyright 2007 __MyCompanyName__. All rights reserved.
+//
+
+#import "DualWindow.h"
+
+
+@implementation DualWindow
+
+- (id)initWithContentRect:(NSRect)contentRect styleMask:(NSUInteger)windowStyle backing:(NSBackingStoreType)bufferingType defer:(BOOL)deferCreation
+{
+	self = [super initWithContentRect:contentRect styleMask:windowStyle backing:bufferingType defer:deferCreation];
+	if (self)
+	{
+	}
+	
+	return self;
+}
+
+- (NSString *)hiddenDefaultsKey
+{
+	if ([self frameAutosaveName])
+	{
+		return [[self frameAutosaveName] stringByAppendingString:@" Window Content Height"];
+	}
+	
+	return nil;
+}
+
+- (BOOL)isHidden
+{
+	return [[NSUserDefaults standardUserDefaults] boolForKey:[self hiddenDefaultsKey]];
+}
+
+- (void)setHidden:(BOOL)h
+{
+	[[NSUserDefaults standardUserDefaults] setBool:h forKey:[self hiddenDefaultsKey]];
+}
+
+- (void)toggleToolbarShown:(id)sender
+{
+	[otherWindow showWindow];
+}
+
+- (void)showWindow
+{
+	[otherWindow close];
+	[self makeKeyAndOrderFront:self];
+}
+
+@end