That skin is kind of experimental and not sure whether I will continue to work on it in the future because ExtJs changed their license to GPL and I can no longer get upgrades to ExtJs.
It is designed like all the mojoportal skins to adapt the layout according to whether content exists. So if no content exists it will hide the empty pane. In the past I have come across cases where my client wanted to show the right column even though it is empty. To make this possible I created an empty module (see /Modules/EmptyModule.ascx) so I can put an empty module on the right and trick it into showing the right pane.
This module exists but is not installed by default, you can install it from the UI under Administration Menu > Advanced Tools > Feature Installation
Use "Empty Module" for the name and for the control src use "Modules/EmptyModule.ascx"
Now you can add an empty module to the page on the right side and it will make it show the right side but no content will be there because empty module is empty.
Hope it helps,