I have a listbox sorted alphabetically, with a text box above. What I want to do is allow the user to type in a search in the text box and as they type the list box selection changes gradually.

E.g if my list is
Arsenal
Chelsea
Man City
Man United

as the user types 'M' it moves to Man City and then stays there unless they type 'an u' which then changes the list to man united.

any ideas?