Adding Custom Styles in 9.10 SP1 Updated December 20, 2017 19:22 Description Custom styles added to the StyleConfig.js file are not showing up in the editor when you use the Inspector. Cause A few lines of code are commented out in the 'Workarea\FrameworkUI\js\Ektron\Controls\EktronUI\Editor\Aloha\plugins\ektron\advancedinspector\lib\advancedinspector-plugin.js' file. Resolution To allow custom styling in the editor's Inspector: Edit 'Workarea\FrameworkUI\js\Ektron\Controls\EktronUI\Editor\Aloha\plugins\ektron\advancedinspector\lib\advancedinspector-plugin.js'. Un-comment all instances of: //var thisinstance = new BasicStyle("listid", clickedon, styleConfigJson); //$ektron('.ektron-aloha-advinspector-modal .basic').append(thisinstance.create()); Save the file. Clear all cache. Caching for this function can be deep, so you should also clear server, browser, and site cache.