def get_contact_group_by_id(contact_group_id)
      request_params = { :ContactGroupID => contact_group_id }
      response_xml = http_get(@client, "#{@xero_url}/ContactGroups/#{CGI.escape(contact_group_id)}", request_params)

      parse_response(response_xml, {:request_params => request_params}, {:request_signature => 'GET/contactgroup'})
    end
def get_contact_group_by_id(contact_group_id)
      request_params = { :ContactGroupID => contact_group_id }
      response_xml = http_get(@client, "#{@xero_url}/ContactGroups/#{CGI.escape(contact_group_id)}", request_params)

      parse_response(response_xml, {:request_params => request_params}, {:request_signature => 'GET/contactgroup'})
    end
Retreives a contact group by its id.