Hi,
why interface checkbox is not visible
Generally, if you create an interface method, it will be available in interface controller, but when you create an interface method in Enhancement implementation, it cannot be added in the interface controller. So, you cannot create an interface method/context in Enhancement implementation.
A work around could be, (if there is no event handling); creating a global singleton class and share the data across the class between the two components.
Hope this helps u,
Regards,
Kiran