private function loadDataGrid()
{
// create datagrid
$this->dataGrid = new BackendDataGridDB(BackendSearchModel::QRY_DATAGRID_BROWSE_STATISTICS, BL::getWorkingLanguage());
// hide column
$this->dataGrid->setColumnsHidden('data');
// create column
$this->dataGrid->addColumn('referrer', BL::lbl('Referrer'));
// header labels
$this->dataGrid->setHeaderLabels(array('time' => \SpoonFilter::ucfirst(BL::lbl('SearchedOn'))));
// set column function
$this->dataGrid->setColumnFunction(array(__CLASS__, 'setReferrer'), '[data]', 'referrer');
$this->dataGrid->setColumnFunction(array(new BackendDataGridFunctions(), 'getLongDate'), array('[time]'), 'time', true);
// sorting columns
$this->dataGrid->setSortingColumns(array('time', 'term'), 'time');
$this->dataGrid->setSortParameter('desc');
}