Yosemite hot key for answer

As you know in new oS X yosemite we have built in notification system which indicate us with new skype message for example, and let us to reply without showing up whole app. It's very good idea. But I need to have hotkey to avoid clicking reply by mouse in that small notification popup. It will help to make reply faster and to do not look for trackpad or mouse.

Do we have such ability ?

Thanks.