After creating the input focus frame's implementation object, customkeyfocus.C uses it to create the custom widget's implementation object and the public object, then calls x::w::create_focusframe_container(). x::w::create_focusframe_container() constructs the public object for the input focus frame implementation object, and puts the new custom widget into the new input focus frame container. customkeyfocus.C concludes the process by calling the original factory's created_internally().

From the original factory's perspective, one new widget gets created. The widget is the focus frame container, and the focus frame container contains the real custom widget that gets created.