void GridView_CustomCallback(object sender, ASPxGridViewCustomCallbackEventArgs e)
{
ASPxGridView grid = (ASPxGridView)sender;
string[] parameters = e.Parameters.Split(';');
int index;
if (int.TryParse(parameters[0], out index))
{
bool isGroupRowSelected = bool.Parse(parameters[1]);
for (int i = 0; i < grid.GetChildRowCount(index); i++)
{
DataRow row = grid.GetChildDataRow(index, i);
grid.Selection.SetSelectionByKey(row["ProductID"], isGroupRowSelected);
}
}
}
