I would like to initialize the calendar with multiple dates.

My usecase would be to use the Calendar in multiple-select mode in a form to set some information. When someone would like to change this information, they would acces the "Edit Info" Page, and all the previously recorded information would already be entered in the form. How do I pre-select the dates in the calendar? I've tried multiple variation of the SetDate function, but nothing seems to work.

Thanks