From Forum Nokia Wiki

ID	KIJ000296	Creation date	October 27, 2005
Platform	Series 40 3rd Edition	Devices
Category		Subcategory

Keywords (APIs, classes, methods, functions):

Overview

There is an additional feature for updating Canvas. It is possible to have the device’s background image also on the MIDlet’s background. An additional JAR attribute is needed for taking this feature into use.

Description

A MIDlet can have the device’s background image on its background as well. This can be done by using the JAD attribute "Nokia-UI-Enhancement" and give the value "CanvasHasBackground" to it. This affects only Canvas that is not in full screen mode but not full-screen Canvas, GameCanvas, or CustomItems.

Solution

Add the line "Nokia-UI-Enhancement: CanvasHasBackground" to the MIDlet’s JAD file to take the device’s background image to use in the MIDlet.