If all you want is a custom shape button, subclass NSButton and override a few 
methods, -hitTest:.  
http://developer.apple.com/documentation/Cocoa/Reference/ApplicationKit/Classes/NSView_Class/Reference/NSView.html#//apple_ref/occ/instm/NSView/hitTest:

Use whatever image you want.  Then implement hitTest

Composed in mail:
- (BOOL)isOpaque
{
   return NO;
}


- (BOOL)hitTest:(NSPoint)aPoint
{
   BOOL result = [super hitTest:aPoint];
    
   if(result)
   {  
      NSPoint localPoint = [self convertPoint:aPoint fromView:[self superview]];

      if(local point doesn't hit non-transparent color in my image)
      {
          result = NO;
      }
   }

   return result;
}
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