Abstract: Aspects for changing a reflective highlight on a glass appearance window frame of an application window are described. An illustrative method includes steps of displaying a first reflective highlight on a glass appearance window frame of an application window, calculating a second reflective highlight in response to detection of an event, and changing the displayed first reflective highlight on the glass appearance window frame of the first application window to the second reflective highlight. The event may correspond to a command to move and/or resize the application window, determination of a time of day event, determination of a change in active/inactive status of the application window, or to a command to change a reflective highlight configuration. Reflective highlights may be changed automatically and/or in response to receipt of an input from a user to change one or more portions of a reflective highlight configuration.