Purging all family types from a family

Have you ever noticed that however hard you try you can't delete all family types from a family when you in the family editor? Revit all leaves one remain. However, try this...... (BTW I can't take credit for this as some other bright spark posted it in AUGI).

1. Start by loading the family that you want to purge into a new project.
2. Next go to the family tree in the project browser and delete all the types, but not the family itself.
3. Then right click on the family in the project browser and select edit, this will open the family from the project into the family editor.
4. You will need to make sure that the family is not already open as Revit will just switch you to that window.
5. Next, if you go to your family types you will see that there should be no type names.
6. Finally, save the family to a new location.