Drop-down List Box Control (Data Access Pages)
The drop-down list box control on a data access page combines some of the features of a text box and a list box. Use a drop-down list box control when you want the option of displaying and selecting a value from a predefined list.
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Remarks
In Page view, Microsoft Access doesn't display the list until you click the drop-down list box control's arrow.
If you have Control Wizards on before you select the drop-down list box control tool, you can create a drop-down list box with a wizard. To turn Control Wizards on or off, click the Control Wizards tool 
in the toolbox.
You cannot enter values that aren't in the list.
The list can be single- or multiple-column, and the columns can appear with or without headings.