To use checkmarks in your action functions, you must first set the checkmark character to use for the menu, either in the Designer or by calling smn_checkmark(). You can toggle the checkmark status in your action function by calling sf_opt() to turn the MNCHECKSTATUS option ON or OFF. Details on these functions are provided in Chapter 21, "Changing the Appearance of Menus."
If you enable checkmarks for a menu, Vermont Views requires a space in front of every field for a checkmark character, even if that particular field does not use a checkmark. If you do not leave a space in front of the field, Vermont Views will overwrite the first character of the menu field text.
