How to Implement MultiSelect type example but limit to only one selection

[DocAhrens]

I need to implement a select box in ExtJS 4.x that looks like the MultiSelect box, but instead of allowing multi-select, I only want to allow a user only to select a single selection from the list. If I were using an ordinary select in html, I would just add a size value to the select tag, but how can I do this in ExtJS 4.x?

[mitchellsimoens]

Ext JS 3 or 4?

[mitchellsimoens]

Moved this into the Ext JS 4 Q&A forum.