Not Show associated attributes in calendar widght

Hi , Goodmrning ,,i use a calendar widght in mendix application .It's show attributes only own in calendar Data view. The used entity of Calender is have to association to another entity . i want to show associated attributes in Reference Selector those is used in Calender Widght. What can i do for this ? & One another problem have to also "When i open calendar(DataView) through navigation then i see a error :- " Could not create widget calendar.widget.calendar_dv: TypeError: Cannot read property 'length' of undefined " This error only show at only first time when i click in navigation and another i click next again then i not see any error it's show directly calendar (DataView). What can i solve this problem ?
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