file="command_file_path"

Required for pop-up menus and combo boxes. The file attribute is optional for other types of items. The file attribute specifies the path, relative to the Configuration folder, of a command file that contains JavaScript functions to populate, update, and execute the item. The file attribute overrides the enabled, checked, value, update, domRequired, menuID, showIf, and command attributes. In general, if you specify a command file with the file attribute, Adobe Dreamweaver ignores all the equivalent attributes that are specified in the tag. For more information about command files, see The toolbar command API.

Example

file="Toolbars/MM/EditTitle.htm"