RadGrid: rebind detailtable from external event

protected void ReBindExpandedDetailTable()
{
foreach (GridDataItem item in RadGrid1.Items)
{
string aaaValueString= item.GetDataKeyValue("aaa").ToString();

if (aaaValueString== )
{
if (item.Expanded == true)
{
GridTableView nestedView = ((GridDataItem)item).ChildItem.NestedTableViews[0];
nestedView.Rebind();
}
}
}
}