public void DeleteItem()
{
Thing tempThing = new Thing();
tempThing = SelectedThing;
if (Things.IndexOf(SelectedThing) != 0)
{
SelectedThing = Things.FirstOrDefault();
}
else if (Things.Count==1)
{
SelectedThing = null;
}
else
{
SelectedThing = Things[1];
}
Things.Remove(tempThing);
}
