Hello again! I have followed all the steps, when I start the application, the calendar is displayed correctly, but the moment I press a date, the window to add an event opens and from there the calendar breaks. Open the project: Clicking in a Date: Event Added: In Mendix Studio: My steps to use Native Calendar: - Calendar Widget inside a Data View: - Create_Calendar_State_NF: - On_Date_Press_NF: - On_Press_Date_Create Page: More information from logs, this JS is not mine, is from the Widget: I don't find more information, I don't know if it is possible to use it in Mendix 10.8 or this widget is deprecated. Thanks you so much!