void OnSelectedEmployeeChanged()
{
FriendsCollection.Clear();
KnownPersonsCollection.Clear();
if (SelectedEmployee == null)
{
return;
}
GetFriends(SelectedEmployee).ForEach(friend => FriendsCollection.Add(friend));
GetKnownPersons(SelectedEmployee).ForEach(friend => KnownPersonsCollection.Add(friend));
}
