public GroupColumn this[
	string ColumnName
] { get; set; }

Public Property Item ( 
	ColumnName As String
) As GroupColumn
	Get
	Set

public:
virtual property GroupColumn^ Item[String^ ColumnName] {
	GroupColumn^ get (String^ ColumnName) sealed;
	void set (String^ ColumnName, GroupColumn^ value) sealed;
}

function get_Item(ColumnName);
function set_Item(value);