JToolbarHelper::apply('example.save');
JToolbarHelper::apply('example.save', 'Save & Close', 'save');
JToolbarHelper::apply('example.save', 'Save', 'check', 'SaveRecord');Here, we are adding a custom callback function named "SaveRecord" that will be executed when the button is clicked. This is useful when you need to perform some custom logic before or after saving the data. Overall, JToolbarHelper apply is a useful tool for creating toolbars in Joomla extensions quickly and easily.