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The DockLastChildToEnd property determines whether the last child element should be docked to the bottom right corner of the AppointmentWrapPanel. The default value is False. This is a dependency property.
public bool DockLastChildToEnd { get; set; }
For the sample of using look at IntervalAppointmentTemplate in Office 2007 themes. It always shows appointment icons in the bottom right corner of the AppointmentWrapPanel.