You can use this setting to add additional TinyMCE buttons to your WYSIWYG editing toolbar:
$_LW->CONFIG['TOOLBAR_ADD_BUTTONS']=['hr', 'anchor'];
Add additional TinyMCE WYSIWYG buttons
Accepted values: array of strings
Context: Global (client/global.config.php)
You can use this setting to add additional TinyMCE buttons to your WYSIWYG editing toolbar:
$_LW->CONFIG['TOOLBAR_ADD_BUTTONS']=['hr', 'anchor'];