Date picker widget: Assign the designer to the date picker control
To assign the multi view designer to the date picker control you must add the following attribute to the DatePickerField class definition:
[ControlDesigner(typeof(DatePickerFieldDesigner))]
EXAMPLE: For more information about the content of the file, see the DatePickerField.cs file of the downloaded sample project.
After you create the date picker control and the multi view designer for it, you must register the control in Sitefinity CMS backend. For more information, see Date picker widget: Register the date picker control.