Can't add custom class in designer properties

[millicandavid]

The "Add class" control in the designer properties allows the user to type in their own value. I was assuming that I could add my own custom class from there but I couldn't find a way to persist that change. Clicking apply doesn't seem to do anything. When I switch to HTML view I don't see the class but oddly the properties control has the class name that I typed in there but all other values in the properties control are gone. I may not be describing this perfectly so give it a shot yourself to see what I mean.

[mattduffield]

You should be able to simply type in a class and then enter to add the class.

If you want to remove a class, you must first click the X to delete it and then click Apply to persist in the DOM.

Regardless of either add or removing classes still need to be saved.