You can use the following action statements with a combination box.
| Action | Description | 
| add | Creates a combination box at runtime. | 
| add to | Allows you to insert options in the list box at runtime. | 
| change text | Changes the text displayed in the entry field. When you use the change text statement, ESL will reset the selected line number back to zero. (Therefore, if a previous selection was made and the selected line number was not saved, the selected line number is lost.) | 
| 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 entry field. | 
| disable | Causes the combination box to be grayed and prevents the user from moving to or modifying the entry field or selecting from the list box. | 
| enable | Causes the combination box to be drawn in normal color and allows the user to move and/or modify the entry field or select from the list box. | 
| make helpid | Changes the help ID of the combination box. | 
| make parameter | Change parameter string associated with the combination box. |