Help writing EC plugin with multiple configurations in GWT

I am trying to write a GWT plugin that provides the ability to create and manage multiple sets of configuration parameters.

Most of the configurable plugins that ship with EC offer this ability. Their configuration pages show a 'Create Configuration' link on the right, and a list of existing configurations (that can be modified or deleted) on the left side of the page.

I have built and deployed the ConfigureExample that is included in the CommanderSDK examples, however, it only allows a single set of configuration parameters. I have also investigated the HomepagePlus-Plugin from EC github, but again, it only surfaces a single configuration set.

In addition, I've delved through the actual install directories of the plugins that provide this ability in order to get a clue as to how it is done, and although I've found some common elements, without any actual code, I am at a loss to put it all together.

I am asking if someone could possibly point me to some example code for a plugin that manages multiple configurations.