Hello Tim,
To add a class the Apply Css dropdown create a stylesheet file reference it in the Editor codefile:
In the toolsFile, you can just add the ApplyClass tool:
and if you want to customize the way your custom CSS classes are listed in the dropdown, you can achieve this by adding a <classes> section in the toolsfile as well:
All the best,
Stanislav Velikov
the Telerik team
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