Image overlay probleme (SWT)

[hi]

hallo
Ich möchte ein Image über ein Image legen. Das Overlay image wird allerdings nicht angezeigt. Woran liegt das??? Kennt sich da jemand aus???

public class MappingImageDecorator extends CompositeImageDescriptor {

   private Image baseImage;

   private ImageDescriptor overlayImageDescriptor;

   private Point sizeOfImage;

   public MappingImageDecorator(Image baseImage,
         ImageDescriptor overlayImageDescriptor) {
      this.baseImage = baseImage;
      this.overlayImageDescriptor = overlayImageDescriptor;
      this.sizeOfImage = new Point(baseImage.getBounds().width, baseImage
            .getBounds().height);
   }

   protected void drawCompositeImage(int width, int height) {
      drawImage(baseImage.getImageData(), 0, 0);

      ImageData overlayImageData = overlayImageDescriptor.getImageData();

      drawImage(overlayImageData, 0, 0);
   }

   protected Point getSize() {
      System.err.println("Width = " + baseImage.getBounds().width);
      System.err.println("Height = " + baseImage.getBounds().height);
      return sizeOfImage;
   }

}