Hello, I recently purchased a Apple Airport Express & Extreme and have planned to use WDS. Now according to this article (http://support.apple.com/kb/HT4262), I tried and was successful up to "Configuring a WDS main base station" but only setting Airport Express as main base station. But after that I was not able to follow the article as Airport Extreme doesn't shows "Participate in a WDS network". It only shows this two: http://cl.ly/4LGH How can I continue further? Notes: 1) I want to make one base station and another remote station. 2) Would prefer Airport Express to base station & Extreme to be remote station, but vice versa will be fine too.