This command clears the contents of a textbox.
Note: It is only necessary to use this on textboxes with NVL behaviour. ADV textboxes are cleared automatically whenever a new line is displayed on it. See textbox for details about NVL and ADV.
(( n: This is a line, displayed on an NVL textbox. ))
(( n: This line will be displayed on the textbox, while the first on is still there. ))
. clear @my_tb
(( n: This is now the only line on the textbox, because it has been cleared before. ))