A computer-implemented method of selecting event handlers can include initiating a drag and drop operation for a source object and, responsive to detecting contact between the source object and a window of a graphical user interface, displaying a plurality of icons, wherein each icon represents an event handler for a drop target within the window. Power consumed by a power steering device is changed in response to a vehicle speed. Finally, information about the common data and other data, which is data in the second data group other than the common data, is displayed in a distinguishable manner.