If you go to 'Quest - Tutorials and Templates' (
http://textadventures.co.uk/games/view/ ... -templates), play the game, type 'move rooms', '8', '1', it will take you to a room where you see a working example of a 'homemade' menu. You can goof around there if you like and see how it works in-game, but if you type 'explain room', you will get a step-by-step guide on how to create what I did in that room. You can also download the .aslx file in the mentioned link in the game description to see how it is set up in the GUI.
Please ask if you have questions.