Question: When is a listbox not a listbox?
Answer: When you see a Parse command on the same window.
What appear to be listboxes on many VBLM option windows are in fact multiline edit controls. Their purpose is to display and maintain user-editable lists. If they were listboxes, they would need Add, Edit and Delete buttons. Instead, you simply position the caret and type, taking care to separate individual items with spaces or carriage returns. To see how VBLM will parse and sort the list, click Parse.
The Parse buttons are provided for your convenience and are not necessary. VBLM always parses when you close the window.
Quirk: If the token you've added is wider than the edit control (most likely on the SX Options window), it will wrap to the next line. Don't worry, though, parsing is unaffected. You can also widen the SX edit controls by widening the SX window.