You can use the following action statements with a drop-down list.
| Action | Description | 
| add | Creates a drop-down list at runtime. | 
| add to | Allows you to insert options in the list box at runtime. | 
| change text | Changes the text displayed in the selection field. | 
| change window position | Allows you to indicate which block of lines should be displayed. Note that you cannot use change window xposition [of] for list boxes. | 
| clear | Clears the contents of both the list box and the selection field. | 
| disable | Causes the drop-down list to be grayed and prevents the user from moving to or modifying the selection field or selecting from the list box. | 
| enable | Causes the drop-down list to be drawn in normal color and allows the user to move and/or modify the selection field or select from the list box. | 
| make helpid | Changes the help ID of the drop-down list. | 
| make parameter | Change parameter string associated with the drop down list. |