NOVELTY - The device (36) has a component placed behind a window (24) and comprising an image capture device, a strobe flash, a biometric sensor (34), a light sensor, a proximity sensor and a solar panel. A data processing circuitry determines when an event requesting that the component is to be exposed occurs. A window controller causes the window to become transparent to expose the component upon the occurrence of the event requesting that the component is to be exposed, where the event comprises a camera application requesting that the camera and strobe flash is to be used or exposed.    USE - Handheld electronic device. Uses include but are not limited to a cellular phone, portable phone, media player, personal data organizer, handheld game platform, tablet computer, notebook computer, iPad (RTM: tablet computer), iPod (RTM: Portable media player), iphone (RTM: coating applied to bare sheet steel products) and Macbook (RTM: notebook computer).    ADVANTAGE - The device can expose the concealed components by causing the electronic window to change opacity, thus allowing the components to suddenly appear. The device provides enhanced functionality and aesthetic appeal by concealing components of the device behind the window. The components can be concealed behind the window in the device so as to avoid cluttering the enclosure of the device with seldom-used components. The device provides components behind the window so as to provide aesthetic benefit to the device by allowing the components to remain unseen and hidden behind the window until access to the component is desired.    DETAILED DESCRIPTION - The window is a polymer dispersed liquid window. INDEPENDENT CLAIMS are also included for the following:    (1) a method for authenticating a user of an electronic device    (2) an article comprising a set of instructions for operating an electronic device.    DESCRIPTION OF DRAWING(S) - The drawing shows a schematic view illustrating a process for unlocking an electronic device by authenticating a user using a concealed biometric sensor of the electronic device.    Display (18)    Window (24)    Biometric sensor (34)    Handheld electronic device (36)    Lock screen (160)    Request (162)    Home screen (168)