Developers used frameworks to create their User Interface. Those frameworks are developed in a specific version of a language and can be used until the retro-compatibility is broken. In such case, developers need to migrate their software systems to a new GUI framework. We proposed a three-step approach to migrate the front-end of an application. This approach includes an importer, a GUI meta-model and an exporter. We validate our experiment on 6 projects in Pharo. We are able to migrate 5 out of 6 projects that all conserve their widgets organization.