It is currently possible for developers to add new actions in the Sirius tabbar by using the general eclipse extension point org.eclipse.ui.menus. This mechanism allows adding new actions after a group of existing Sirius actions. However, it is not possible to hide the default Sirius actions or to change their order. This evolution aims to provide a new Sirius extension point that will let developers to provide a specific tabbar items list according to the current selection.