Essential Addons for YOOtheme Pro uses best practices when extending YOOtheme Pro, becoming in an essence a core feature. That means that if you know how to extend YOOtheme Pro, you know how to extend the Addons. If you don't, we invite you to visit the Yootheme Pro Developers Guide first.
The Addons are composed of YOOtheme Pro modules encapsulated into a plugin named yooessentials. The plugin is located at
plugins/system/yooessentials in Joomla and
wp-content/plugins/yooessentials in WordPress.
You can create your plugin and extend YOOtheme Pro or the Essential Addons the same way, allowing you to further expand the system.