NSPopUpButton is disabled under Linux

[Christian Husmann]

Hi!

I have a problem with the NSPopupButton. I've build a gui with that 
NSPopUpButton and on the Mac it's working, but when I run the same 
application the popup is disabled.
What can i do?

greetings
Christian

I'm using this code for creating the popupbutton:
@implementation NSPopUpButton (NSPopUpButtonBundleExtension)

- (id)initWithElementDic:(NSDictionary *)dic
{
   NSArray *array = [[dic objectForKey:@"rect"] 
componentsSeparatedByString:@","];
   NSRect rect = ([array count] == 4 ? NSMakeRect([[array 
objectAtIndex:0] floatValue], [[array objectAtIndex:1] floatValue], 
[[array objectAtIndex:2] floatValue], [[array objectAtIndex:3] 
floatValue]) : NSZeroRect);
   if (rect.size.width > 0)
     {
      self = [super initWithFrame:rect];
      if (!self) return nil;

      NSArray *items = [dic objectForKey:@"items"];
      [self insertItemWithTitle:[items objectAtIndex: 0] atIndex:0];
      [self insertItemWithTitle:[items objectAtIndex: 1] atIndex:1];
      [self setEnabled: YES];
      return self;
     }
   return nil;
}

@end