Methods, systems, and apparatus, including computer programs encoded on a computer-readable storage medium, and including a method for managing privacy rights of a user related to the delivery of content. The stent has a nominally deployed state, an axially extended state and an axially compressed state. A sensor unit is disposed adjacent to the nozzle and detects a magnetic field generated by the magnet during nozzle rotation to generate a signal indicative of the speed and direction of rotation of the nozzle. UI objects and folders from other pages move from underneath the dock region onto the user interface.