groupColumn

Method which groups the grid by the column with UniqueName specified as an argument. All server grouping capabilities of RadGrid are applicable for this case as well.

groupColumn(colUniqueName)
colUniqueName	String	The UniqueName of the column that will be grouped.

Example:

function GroupByColumn() {
    var masterTable = $find("<%= RadGrid1.ClientID %>").get_masterTableView();
    masterTable.groupColumn("Country");
}