Custom ListStyle - How To?

[Adam]

How would I go about creating a custom ListStyle and adding it to the RadRichTextBoxRibbonUI? 

To clarify, I'm in need of a custom numbering scheme for the hierarchical numbered list. Something like this:
1.0
     1.1
          1.1a
          1.1b

etc

[Iva Toteva]

Hi Adam,

There is a blog post about creating multilevel lists and adding them to the default UI here.
It also includes a demo, which you can preview and use as reference.

Best wishes,
Iva
the Telerik team