ControlDecoration decoration = new ControlDecoration( text, SWT.TOP | SWT.LEFT );
decoration.setImage( image );

public Image getImage(Object element) {
		EntityData nodeData = (EntityData) element;
		Image mainImage = NODE_IMAGES.get(nodeData.getType());
		Image downImg = ImageConsts.Images.DOWN_IMG;
		ImageData mainImageData = mainImage.getImageData();
		ImageData iconImageData = downImg.getImageData();
		ImageData targetData = targetData = new ImageData(mainImageData.width, mainImageData.height,
				mainImageData.depth, mainImageData.palette);
		merge(mainImageData, iconImageData, targetData, mainImageData.width-8, mainImageData.height-8);

		Image returnedImage = new Image(InsitePlugin.getDisplay(), targetData);
		
		return returnedImage;
	}
private static void merge(ImageData sourceData1, ImageData sourceData2,
			ImageData targetData, int startX, int startY) {
		// Merge the 1st Image
		merge(sourceData1, targetData, sourceData1.x, sourceData1.x);

		// Merge the 2nd Image
		merge(sourceData2, targetData, startX, startY);
	}

	private static void merge(ImageData sourceData, ImageData targetData, int startX, int startY) {
		int i;
		i = sourceData.x;

		for (; i < sourceData.width; i++) {
			int j = sourceData.y;
			for (; j < sourceData.height; j++) {
				targetData.setPixel(startX + i, startY + j, sourceData.getPixel(i, j));
			}
		}
	}