Extension-configuration-VanillaString

I'm working on an extension which uses a child window to collect configuration values via user controls. I now need to store & retrieve the configuration values. Documentation explains that ConfigurableType needs to be set to vanillastring to support a custom configuration design, but I'm struggling to figure out how to implement this.

If possible, please provide an example of a vanillastring implementation using a child window to collect configuration values.

Here's a snip of what I'm attempting within my child window namespace. This does save my string to the setting.txt file. Should I build a string of pipe delimited values and store in this way?
Note: This is just a test script to help me understand how this works. I will adjust so that I'm setting and recalling the config at the appropriate time once I have a good understanding.

CODE:
namespace WLStrategy.ChildWindows

{

   public partial class MyConfig : Configurable
   {

      //Manually set the name
      public override string Name => "LeapFrogBI.StrategyRunner";

      //We are using VanillaString configuration
      public override ConfigurableType ConfigurableType => ConfigurableType.VanillaString;

      //Manually set config key
      public override string ConfigKey => "LeapFrogBI.StrategyRunner";

      //Set extension to configurable
      public override bool IsConfigurable => true;

   }
   //This child window will appear when the "Demo" menu item is selected under the WL7 Extensions menu
   public partial class StrategySelector : ChildWindow
   {
      //constructor
      public StrategySelector()
      {
         InitializeComponent();
         Configurable Test = new MyConfig();
         Test.Configuration = "My New Config.";
         Test.SaveConfig();
      }

Thank you,
Paul