void setCellBackground () {
		if (!instance.startup) {
			textNode1.setBackground (1, cellBackgroundColor);
			imageNode1.setBackground (1, cellBackgroundColor);
		}
		/* Set the background color item's image to match the background color of the cell. */
		Color color = cellBackgroundColor;
		if (color == null) color = textNode1.getBackground (1);
		TableItem item = colorAndFontTable.getItem(CELL_BACKGROUND_COLOR);
		Image oldImage = item.getImage();
		if (oldImage != null) oldImage.dispose();
		item.setImage (colorImage(color));
	}