Tab Bar Control For Mobile Devices

Methods, systems, and apparatus, including computer programs encoded on a computer storage medium, for providing tab bar controls on a mobile computing device are described. In one aspect, a method includes displaying a first tab graphic in a first tab bar control, the first tab bar control being displayed at a first default position on a first edge of a touchscreen display, detecting a user selection in a first region of the touchscreen display, the first region associated with the first tab graphic, detecting user motion, animating the first tab bar control to extend from the first edge of the touch-screen display in response to detecting user motion, determining a measure of user motion, comparing the measure of user motion to a threshold measure, and performing one or more functions on the mobile device in response to the measure of user motion exceeding the threshold measure.