The KeepTimesAtDrop attached property determines the behavior of moved (dragged) appointments. If this value is True, after dragging an appointment to the desired VisualInterval, the Appointment start date is changed to the VisualInterval start date. If this value is False, the Appointment.Start becomes equal to the VisualInterval.StartTime, and Appointment.Duration becomes equal to the VisualInterval.TimeScale. The default value is False.

'宣言
 
Public Shared ReadOnly KeepTimesAtDropProperty As System.Windows.DependencyProperty

public static readonly System.Windows.DependencyProperty KeepTimesAtDropProperty