Setting refresh rate with DisplayMode

Question

I'm having a problems setting the refresh rate of the DisplayMode, originally I used this method to create a display mode:
DisplayMode(320, 240, 16, DisplayMode.REFRESH_RATE_UNKNOWN);This worked fine and ran my game at the above resolution, however I want the refresh rate to be 60hz so I tried this:
DisplayMode(320, 240, 60);The game ran, but the resolution did not change and the game played in a little 320, 240, box in the top left corner of the screen leaving the rest of the screen white. This is the same problem I have when ever I try the GAGE shooter demo.
Am I setting up the DisplayMode right, or is this a known bug.
I've only tried this on my computer running winME and the SDK 1.4.2_01.
Thanks.

Answer 1

Hmm, I think I'm missing something here but I just looked at GraphicsDevice.java and as far as I can see it doesn't check for refresh rates.
     * Returns the current display mode of this
     * <code>GraphicsDevice</code>.
     * @return the current display mode of this graphics device.
     * @see #setDisplayMode(DisplayMode)
     * @since 1.4
    public DisplayMode getDisplayMode() {
        GraphicsConfiguration gc = getDefaultConfiguration();
        Rectangle r = gc.getBounds();
        ColorModel cm = gc.getColorModel();
        return new DisplayMode(r.width, r.height, cm.getPixelSize(), 0);//REFRESH_RATE_UNKNOWN = 0; ??
     * Returns all display modes available for this     
     * <code>GraphicsDevice</code>.
     * @return all of the display modes available for this graphics device.
     * @since 1.4
    public DisplayMode[] getDisplayModes() {
        return new DisplayMode[] { getDisplayMode() };
    }Or have I read this wrong?