public virtual void MoveByIndex(int index, int newIndex)
{
_items.MoveByIndex(index, newIndex);
_keys.MoveByIndex(index, newIndex);
if (ItemMove != null)
{
ItemMove(this, new KeyedCollectionMoveEventArgs(_items[newIndex], newIndex, index, _keys[newIndex]));
}
if (CollectionChanged != null)
{
CollectionChanged(this, new EventArgs());
}
}
