Created attachment 733079 [details]
Yast log

There is a WrapperWidget created in such code:

module Yast
  class ServiceTab < ::CWM::Tab
    include Yast::I18n
    include Yast::UIShortcuts
    def initialize
      self.initial = false
    end

    def contents
      VBox(    
        ::CWM::WrapperWidget.new(
            CWMFirewallInterfaces.CreateOpenFirewallWidget("services" =>
["service:sshd", "service:ntp"]),
              id: "firewall")
      )
    end

    def label
      _("Service")
    end
  end
end

I want to show a firewall widget in the tab in order to open a port, but
actually nothing shown, please see the attached screen shot service_tab.png

And the tabs layout turned to be quite compact, also can be seen in
service_tab.png. You can compare it with tabs.png

y2log also attached.

Thanks