gistfile1.m

var kLEDefaultPreferencesController;

@implementation LEPreferencesController : CPWindowController
{
    
}

+ (id)defaultController
{
    if(!kLEDefaultPreferencesController)
        kLEDefaultPreferencesController = [[LEPreferencesController alloc] init];
    
    return kLEDefaultPreferencesController;
}

- (id)init
{
    self = [super initWithWindow:[[CPWindow alloc] initWithContentRect:CGRectMake(0,0,300,300) styleMask:CPHUDBackgroundWindowMask | CPClosableWindowMask]];
    if(self)
    {
        [_window center];
    }
    
    return self;
}

- (void)openPreferences:(id)sender
{
    [self showWindow:sender];
}

@end