>Here's a simple question: Which control property do I use to restrict users from editing the value in a combo box control? As it stands now, a user can simply click on the combo box and type in any value.
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>Thanks!

Generally, each user can have some associated value (secutiry level) which might be evaluated in different spots of interface/application flow.
Also, you may change Combo.Style property to 2 to allow selecting from list only.