AllowAppointmentResize プロパティ

using System.Collections.Generic;
using Infragistics.Win;
using Infragistics.Win.UltraWinSchedule;
using System.Diagnostics;

    public void InitActivityProps( UltraTimelineView control )
    {
        //  Align activities with the PrimaryInterval, so that the
        //  edges of the elements are flush with the time slot borders
        control.AlignActivityWithPrimaryInterval = DefaultableBoolean.True;

        //  Set the height of the bar color indicator, and show it
        control.AppointmentDisplaySettings.BarColorIndicatorHeight = 5;
        control.AppointmentDisplaySettings.BarColorIndicatorVisibility = TimelineViewBarColorIndicatorVisibility.ShowOnTop;

        //  Show continuation arrows for appointments whose start/end time is not visible
        control.AppointmentDisplaySettings.DateTimeContinuationIndicatorVisibility = TimelineViewDateTimeContinuationIndicatorVisibility.Both;

        //  Don't display the resolved appointment appearance image to conserve space
        control.AppointmentDisplaySettings.DisplayAppearanceImage = DefaultableBoolean.False;

        //  Display the appointment subject, but not the location
        control.AppointmentDisplaySettings.DisplayLocation = DefaultableBoolean.False;
        control.AppointmentDisplaySettings.DisplaySubject = DefaultableBoolean.True;
        
        //  Display the recurrence and reminder indicators on the left
        control.AppointmentDisplaySettings.RecurrenceIndicatorVisibility = TimelineViewRecurrenceIndicatorVisibility.Right;
        control.AppointmentDisplaySettings.ReminderIndicatorVisibility = TimelineViewReminderIndicatorVisibility.Left;

        //  Display the start and end times, each on either side of the subject
        control.AppointmentDisplaySettings.TimeVisibility = TimelineViewAppointmentTimeVisibility.BothSeparate;

        //  Only allow dragging appointments within the same owner
        control.AppointmentDragMode = TimelineViewAppointmentDragMode.WithinSameOwner;

        //  Always show appointment tooltips
        control.AppointmentToolTipVisibility = TimelineViewActivityToolTipVisibility.Always;

        //  Hide all-day events from the timeline view
        control.AppointmentVisibility = TimelineViewAppointmentVisibility.HideAllDayEvents;

        //  Enable automatic creation of appointments when enter key
        //  is pressed on a time slot, and when a time slot is double-clicked
        control.AutoAppointmentCreate = true;
        control.AutoAppointmentDialog = true;

        //  Only show holidays for the unassigned owner, and never show tooltips for them
        control.HolidayVisibility = TimelineViewHolidayVisibility.ShowForUnassignedOwner;
        control.HolidayToolTipVisibility = TimelineViewActivityToolTipVisibility.Never;

        //  Only show activities whose duration is at least one hour;
        //  allow appointment resizing, but only to a duration of
        //  no less than two hours
        control.AllowAppointmentResize = true;
        control.MinimumActivityDuration = TimeSpan.FromHours(1);
        control.MinimumAppointmentResizeDuration = TimeSpan.FromHours(2);
    }