public function handleShowColumn($column)
	{
		$columns = $this->getSessionData('_grid_hidden_columns');

		if (!empty($columns)) {
			$pos = array_search($column, $columns, true);

			if ($pos !== false) {
				unset($columns[$pos]);
			}
		}

		$this->saveSessionData('_grid_hidden_columns', $columns);
		$this->saveSessionData('_grid_hidden_columns_manipulated', true);

		$this->redrawControl();

		$this->onRedraw();
	}