A stationary interface control knob includes a body having a fixed substantially-cylindrical surface with a first axis, and a flexible touch panel sensor having a sensor surface at least partially in cylindrical form with a spaced relationship from the fixed substantially-cylindrical surface. The sensor surface has a second axis coinciding with the first axis. The flexible touch panel sensor senses a user interaction with the fixed substantially-cylindrical surface and generates an interface signal in response thereto. Also discloses are method of controlling the stationary interface control knob.