如何获得用于Telerik RadGridView列的上下文菜单?

private void CreateNewColumn(FieldDescriptor fd, uint fieldno) {
    fieldGrid.Columns.Add(new GridViewDataColumn() {
        UniqueName = fd.fieldName,
        Header = fd.displayName,
        DataMemberBinding = new Binding("Fields[" + fieldno + "]"),
        ContextMenu = new ContextMenu() {
            Tag = fieldno,
            Items = {
                new MenuItem() {
                    Header = "Field Properties",
                    Command = Commands.FieldProperties,
                    CommandBindings = { new CommandBinding(Commands.FieldProperties, FieldProperties_Execute) } 
                },
                new MenuItem() {
                    Header = "Delete Field",
                    Command = Commands.DeleteField,
                    CommandBindings = { new CommandBinding(Commands.DeleteField, DeleteField_Execute) }
                }
            }
        }
    });
}

fieldGrid.ContextMenu = new ContextMenu() { ...