I am still not able to reproduce this problem. One thing to note is that the Appointment must belong to the UltraCalendarInfo.Appointments collection in order to be selected. If you are able, attach a simple sample that demonstrates the problem to this thread and we can take a closer look.

We have the same behaviour.

CalendarInfo.SelectedAppointments.Add(oAppointement); does not select the appointment in dayView

Yes i must describe more..

I create a UserControl where when you do a right clic on an Appointement i get the Appointment (with the mouse location) and, in the event, i need change the Selected Appointement

private void uc_monthViewer_MouseDown(object sender, MouseEventArgs e)

{

     Appointment oAppointement = uc_monthViewer.GetAppointmentFromPoint(e.Location);

     if (oAppointement != null && e.Button == MouseButtons.Right)

     {

          _oCalendarInfo.SelectedAppointments.Clear();                  

          _oCalendarInfo.SelectedAppointments.Add(oAppointement);

          // or this : _oAppointement.Selected = true;

     }

}

Thanks u for your help