With IDEA 12 it was possible to open the JetGradle View even if the current project was not a gradle projcet. But the view displayed the message "There is no linked Gradle project. You can Add one" and offered you the possibility to convert the project to an gradle project with a simple click.
In IDEA 13 it is not possible to open the Gradle View when the current project is not a gradle project. So someone has to import the project and than it is possible to show the Gradle View. Why was the (simplier) convertion removed?
Kind regards, CL