private void Delete(FileItem obj)
{
if (SelectedItem == obj)
{
var i = Session.Files.IndexOf(obj) - 1;
if (i < 0)
{
i = 0;
}
SelectedItem = Session.Files.Count > 0 ? Session.Files[i] : null;
}
Session.Files.Remove(obj);
obj.CleanUp();
}
