How to set a combo box to automatically select an item...

[tripnotic]

when entering a number or a string in the textbox(on top of the control) of the combo box.

For example:
The combo box item is:
10
20
21
30
45

If a user key in the value 2 it would automatically select the 20 first because it is the first "2" in the list.

I remember setting one of the combo box properties to get it to work but I forgot now.