Steps to reproduce:
  1.Open the attached solution, build and run the sample application.
    2.There are two appointments created in the view. Double click the 'Appointment2' to edit it.
    3.Select 'Room 1' from the 'Room' combo box and unselect 'Room 2'.
    4.Click OK to apply the changes.
    5.'Appointment2' is moved to 'Room 1' however it also becomes unselected as the 'Appointment1' becomes the selected one.