Command Box (Control)

Either display the list box permanently or do not display it at all.

When the user invokes the default action of the command box, issue the command in the text field of the command box.

If the command is issued successfully, add the command to the end of the list box.

If the last command in the list box is selected, and a successfully issued command adds the new command to the end of the list, select the new command.

If the command failed, issue a warning signal but do not add the command to the end of the list box, and leave the command unchanged in the text field.