Reference_Syntax.open = “userControl | onEntry | always | multiSelect”
• userControl (default)The list drops down when the user clicks on a button or makes some other appropriate gesture. The list disappears when the cursor moves outside the list or some other appropriate user-interface event occurs.
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• The user can select multiple entries from the list by pressing the Shift key while making selections. The list of choices is displayed when the field is visible.