public function actionSaveExpansion()
{
$this->requireAjaxRequest();
$this->requirePostRequest();
$expanded = craft()->request->getPost('expanded');
$blockId = craft()->request->getPost('blockId');
$block = craft()->neo->getBlockById($blockId);
$block->collapsed = $expanded === 'false' ? true : !$expanded;
$success = craft()->neo->saveBlockCollapse($block);
$this->returnJson(['success' => $success]);
}