int getContentWidth (int columnIndex) {
	int width = textWidths [columnIndex] + 2 * MARGIN_TEXT;
	if (columnIndex == 0) {
		width += parent.col0ImageWidth;
		if (parent.col0ImageWidth > 0) width += CTable.MARGIN_IMAGE;
	} else {
		Image image = getImage (columnIndex, false);
		if (image != null) {
			width += image.getBounds ().width + CTable.MARGIN_IMAGE;
		}
	}
	return width;
}