1. A method in a computing system for displaying on a display device a discovery interface of a media application executing on the computing system, the method comprising: displaying, on the display device, a unified discovery interface including a broadcast channel row for listing an offering of available broadcast television programming content for a given time slot and a virtual channel row associated with the broadcast channel row for listing offerings of available non-broadcast video-on demand programming content; presenting the offerings of available non-broadcast video-on demand programming content as a plurality of graphical tiles within a the virtual channel row of the unified discovery interface, each graphical tile representing an offering of available non-broadcast video-on demand content related to the available broadcast television programming content and having at least one dimension parameter designated for an unfocused state of the graphical tile; receiving input moving focus within the unified discovery interface; detecting that the focus has been moved to the virtual channel row and to one of the graphical tiles within the virtual channel row; altering display of the unified discovery interface such that at least one dimension of the focused graphical tile within the virtual channel row is displayed as expanded to exceed at least one corresponding dimension parameter designated for the unfocused state, responsive to the detecting.