Regarding using the DNN TextEditor control, which will use whatever editor is configured as the default (RadEditor, CKEditor, etc.), please see this Wiki entry:

Text Editor Control

As for using other Telerik controls, I'm trying to move away from them toward lighter weight and I'm finding less frustrating to style jQueryUI and jQuery plugins/widgets controls or in some cases writing my own special purpose controls using knockout js for data-binding.

For more information on DNN and Telerik going forward, please see: DNN and Telerik Rad Controls

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Bill, WESNet Designs
Team Lead - DotNetNuke Gallery Module Project (Not Actively Being Developed)
Extensions Forge Projects . . .
Current: UserExport, ContentDeJour, ePrayer, DNN NewsTicker, By Invitation
Coming Soon: FRBO-For Rent By Owner