@Override
	public String toString() {
		StringBuilder buffer = new StringBuilder();
		buffer.append(super.toString());
		buffer.append('[');
		boolean needComma = false;
		for (FlexCell cell : mChildren) {
			if (needComma) {
				buffer.append(", "); //$NON-NLS-1$
			} else {
				needComma = true;
			}
			buffer.append(cell);
		}
		buffer.append(']');
		return buffer.toString();
	}