Not possible to undo parent item!

I wanted to undo an parent catagorie.. but when i want to edit it, this popup has no save bottun.. :dry:
So its not possible to choose 'none' for a parent.. and it just stays like you first selected it..

You cannot save a category without a parent. Each category must have a parent.
You can however select another one. Just click on its name in the popup.

I want the 'product category' to be the parent.. i cannot select none at the second dropdown..
There is no save button..

Click on the "root" link on the left, then click on the "use" icon of the "product category" category.

Ahh.. that worked! Thanks!