27 Nov 2008
21 Oct 2011
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The Telerik guys may correct me in this, but you may have to create a custom Content block control to achieve something like that. Until, the Telerik guys come back to you with a better idea, here is a very bad idea for now.
In the CssClass field you can define multiple CSS classes with spaces inbetween. Specify all the classes that you need but spell correctly just the one that you currently need to be applied. That way, when you want to change the CSS class, you just mis-spell the current one and correct the spelling on the one you want. You can have a "1" at the end or something. How is that for a very bad idea?
I wish they had a poll for the worst ideas, this one would definitely win. By the way, I have not tried it at home myself, so no guarantees.