A configurable controlling device and associated editor program that allows a consumer to create on a personal computer for downloading to the controlling device a user interface comprised of user interface pages having icons which icons, when activated on the controlling device, cause the controlling device to perform a function, such as to transmit a command to an appliance, to change the user interface page being displayed, etc. The editor program allows for the visualization of links created between user interface pages, single step assigning of commands to logical groups of function keys (both iconic and hard keys), single step assigning of backgrounds to groups of user interface pages, and pre-rendering of user interface pages prior to the downloading of the user interface to the controlling device.