DNN – Enable custom CSS classes to appear in Telerik Editor by Berrada

Hi there, I have a DotNetNuke 6.1.4 installation and wish to add some custom CSS classes in the CSS dropdownlist in the Telerik RadEditor. I have added the editor.css file and it seems to be detected however the classes in the ‘Apply CSS Class’ remains empty… (Budget: $30-$120 AUD, Jobs: DotNetNuke)