/// <summary>
/// After removing or inserting a row, ensure that the cached indexes (used for layout) match up
/// with the item index in the list
/// </summary>
protected void RefreshIndexCache()
{
for (var i = 0; i < _visibleRows.Count; i++)
{
_visibleRows[i].Index = _itemList.IndexOf(_visibleRows[i].Data);
}
}