/**
  * Constructor
  * @param $uploaderUserGroup UserGroup The user
  *  group to be represented in this column.
  */
 function UploaderGridColumn(&$uploaderUserGroup)
 {
     parent::UserGroupColumn($uploaderUserGroup, 'uploader');
 }
 /**
  * Constructor
  * @param $signoffUserGroup UserGroup The user
  *  group to be represented in this column.
  * @param $stageId integer One of the WORKFLOW_STAGE_ID_* constants.
  * @param $requestArgs array Parameters for cell actions.
  */
 function SignoffStatusGridColumn(&$signoffUserGroup, $stageId, $requestArgs)
 {
     $this->_stageId = $stageId;
     $this->_requestArgs = $requestArgs;
     parent::UserGroupColumn($signoffUserGroup, 'signoff');
 }