* - abbrev: (boolean) Abbreviate long mailbox names by replacing the * middle of the name with '...'? * DEFAULT: Yes * - basename: (boolean) Use raw basename instead of abbreviated label? * DEFAULT: false * - heading: (string) The label for an empty-value option at the top of * the list. * DEFAULT: '' * - inc_notepads: (boolean) Include user's editable notepads in list? * DEFAULT: No * - inc_tasklists: (boolean) Include user's editable tasklists in list? * DEFAULT: No * - inc_vfolder: (boolean) Include user's virtual folders in list? * DEFAULT: No * - iterator: (Iterator) Tree iterator to use. * - new_mbox: (boolean) Display an option to create a new mailbox? * DEFAULT: No * - optgroup: (boolean) Whether to use elements to group * mailbox types. * DEFAULT: false * - selected: (string) The mailbox to have selected by default. * DEFAULT: None *