componentRefList Inheritance and Overriding

By default, a derived component inherits the <componentRefList> element contents of its base component. When a derived component declares a <componentRefList>, its contents are effectively merged with those of the base component. The derived component may declare new <componentRef> elements and override inherited ones, but may not remove elements declared by the base component.

A derived component may override the <type> element declared by the <componentRefList> of the parent component by re-declaring the <type> within its <componentRefList>. In this case, the overridden type must be an instance of the original type, or the original must be unspecified. Furthermore, all referenced components must be instances of the overridden type, including those inherited from the base component.