f3218016_Element_IDs__Id_Description
[Type] Calendar Selection [Ids & Syntax] {gCalMarkup _id/}.calendarSelect[.groupId].calendarId [Visible] Yes [Id Description] 
An optional element used to select calendars and is usually an checkbox. calendarId is the id of the calendar this checkbox selects. The element has an onclick attribute set to call the selectionChanged() function which may load or unload the associated calendar.
Element IDs
Id Description