A method for customizing the graphical user interface of a multi-function device includes the steps of: (a) providing a multi-function device including a multi-function unit and a document server, where the multi-function device includes three or more built-in functions such as copying, printing, scanning, faxing, and emailing, and the multi-function unit includes a graphical user interface originally configured to display standard icons representing the built-in functions, where the user may activate the standard icons to command the multi-function device to perform the associated built-in function; (b) selecting an additional function to be available on the multi-function device; and (c) automatically adding a new icon associated with the additional function to the graphical user interface of the multi-function unit. The additional function may include a proprietary, third-party application and the new icon associated with the additional function may be a logo and/or a phrase (such as a product name/trademark) associated with the proprietary, third-party application.