anchor.diff:  		      :initarg :show-as-default-p
   		      :accessor push-button-show-as-default-p))
     (:default-initargs
  +   :text-style (make-text-style :sans-serif nil nil)
       :background *3d-normal-color*
       :align-x :center
       :align-y :center
  
positive.code: 			    standard-gadget-pane)
    ()
    (:default-initargs
      :background *3d-normal-color*
      :x-spacing 3
      :y-spacing 2
  
negative.code: (defclass check-box-pane (check-box rack-layout-mixin sheet-multiple-child-mixin basic-pane)
    ()
    (:default-initargs
     :text-style (make-text-style :sans-serif nil nil)
     :background *3d-normal-color*))
  
  (defmethod initialize-instance :after ((pane check-box-pane)
                                         &key choices current-selection orientation &allow-other-keys)
  