action = "(function)";
Specifies an AutoLISP expression to perform an action when this tile is selected. Also known as a callback. For some kinds of tiles, an action can also occur when the user switches focus to a different tile.
The possible value is a quoted string that is a valid AutoLISP. expression. A tile can have only one action. If the application assigns it an action (with action_tile), this overrides the action attribute.
