protected function loadData($request, $filter)
{
// Let parent class get data from data provider.
$workflowStages = parent::loadData($request, $filter);
// Filter the data.
if ($filter['allStages']) {
return array_combine($workflowStages, $workflowStages);
} else {
return array($this->getStageId() => $this->getStageId());
}
}