Hi all: Another Celtk challenge for me: The slot CTK::PACKING is missing from the object SENDREQUEST-PUBLISH-RB-GROUP of class #<STANDARD-CLASS CTK::MENU-RADIO-GROUP> during operation SLOT-VALUE [Condition of type PROGRAM-ERROR] is resulting from this piece of code: (mk-row () (mk-stack () (mk-menu-radio-group :id :sendrequest-publish-rb-group :selection (c-in nil) :kids (c? (the-kids (mk-menu-entry-radiobutton :label "Request/Reply" :value :request/reply) (mk-menu-entry-radiobutton :label "Publish" :value :publish) )))) (mk-stack () (mk-row () (mk-label :text "Timeout: " :width 10) (mk-entry :id :timeout-entry :width 6) (mk-label :text "s"))) menu-radio-group inherits from menu-entry which inherits from tk-object. I can't locate the source of this error ... Thanks for any hints! Best, Frank