How to Insert a Dropdown List Box or Combo Box
The difference between a dropdown list box and a combo box is that a dropdown list only allows the end user to choose a pre-defined option from a list, while a combo box allows the end user to either choose an option from the list, or type in a value.
You can create a dropdown list box:
Combo boxes can only be created in the Windows Designer.
If you create the control using the Dropdown List Box display type, allowed values must be defined at domain level. In this case, the dropdown list box appears automatically after synchronization.
If you create the control in the Windows Designer, the values on the list can either be hard-coded, or retrieved from the database by means of a SQL statement or Related Column.
To insert a dropdown list or combo box using the Windows Designer:
If you inserted a Combo Box object and want to turn it quickly into a Dropdown List object, set the Check List property to Yes (the reverse is also possible).
If you use the Value List property, separate the values by means of "returns" (either use SHIFT+ENTER, or CTRL+ENTER). If the actual values are not the same as the prompts you want to use, set the Value List Prompts property (again use returns to separate the values).