NSDictionary *attributes = [NSDictionary dictionaryWithObjectsAndKeys:[NSFont fontWithName:@"Helvetica-Bold" size:14],NSFontAttributeName, nil];
NSMenuItem *menuItem = [[NSMenuItem alloc] initWithTitle:@"Test" action:nil keyEquivalent:@""];
NSAttributedString *attributedTitle = [[NSAttributedString alloc] initWithString:[menuItem title] attributes:attributes];
[menuItem setAttributedTitle:attributedTitle];