Programmatically add a close button to an NSWindow - cocoa

Question

I'd like to add a close button to an NSWindow programmatically. I can get the button to display, but there are no mouse-over or mouse-down effects. My "selector" never seems to get called when i click the button. I'm not really sure whats wrong and why this is so annoying.
Here is what I've been messing with:
closeButton = [NSWindow standardWindowButton:NSWindowCloseButton forStyleMask:self.styleMask];
NSView *themeFrame = [[self contentView] superview];
NSRect c = [themeFrame frame]; // c for "container"
NSRect aV = [closeButton frame]; // aV for "accessory view"
NSRect newFrame = NSMakeRect( c.size.width - aV.size.width - 5, // x position c.size.height - aV.size.height - 5, // y position aV.size.width, // width aV.size.height); // height
[closeButton setFrame:newFrame];
[themeFrame addSubview:closeButton];
[closeButton setAutoresizingMask:NSViewMaxXMargin | NSViewMinYMargin];
[closeButton setEnabled:YES];
[closeButton setTarget:self];
[closeButton setAction:NSSelectorFromString(#"testClick:") ];
Where "testClick" is just a memeber function of my class and is defined as such:
- (void)testClick:(id)sender
The problem seems to be the call to:
[themeFrame addSubview:closeButton];
where the themeFrame is: [[self contentView] superview] Just adding the button to [self contentView] works, but I'd like it added to the titlebar.
No Interface Builder please...

Answer 1

Potential issue # 1)
The way you're calling "NSSelectorFromString" seems incorrect to me. I don't think you can pass parameters via this way in Objective C.
Try this:
[closeButton setAction: #selector(closeWindow:)];
and create a new "closeWindow:" action that looks like:
- (void) closeWindow: (id) sender;
which closes the window.
Potential issue # 2)
Instead of:
closeButton = [NSWindow standardWindowButton:NSWindowCloseButton forStyleMask:self.styleMask];
NSView *themeFrame = [[self contentView] superview];
Why not use:
NSWindow * parentWindow = [[self contentView] window];
if(parentWindow)
{
closeButton = [parentWindow standardWindowButton:NSWindowCloseButton forStyleMask:self.styleMask];
}