private void OnShowUnsubscribedMailboxes(object obj)
{
IsManagingMailboxes = true;
Mailboxes.ForEach(x => x.IsEditing = true);
IsExpanded = true;
}
private void OnHideUnsubscribedMailboxes(object obj)
{
IsManagingMailboxes = false;
Mailboxes.ForEach(x => x.IsEditing = false);
}