how to use activation hook for plugin in class which extends other class.

Hello Guys,

I am developing a plugin to learn plugin development in wordpress, I am using OOP architecture to achieve this. I just want in help to use activation hook in that class. It is working when i did not extend plugin class with WP-Import class. When i extend it with it. It did not call the hook inside the class. It works though out side the class but i want to call it inside.

Please i am not good at english. Thanks in advance.

Best Regards
Gameraiderr