I have a similar problem with the one stated in this question -> Forcing Webplayer in the background

However, I can't seem to grasp the idea on how to actually implement resizing (or even hiding) the canvas where the WebPlayer is at. Can anybody show me how to detect user interaction in Facebook (such as clicking on user's Notifications) and subsequently implement a resizing solution such as described in the link above? Sorry if this is not directl related to Unity as a tool.