Hello Mihajlo,
By design, the border dialog can be shown only from the context menu. We will consider adding such feature if we receive more request for it.
For now, you can manually add a button. It would be easier to inherit the RichTextEditorRibbonBar class because this gives direct access to all elements of the ribbon:
I hope this helps. Should you have any other questions do not hesitate to ask.
Regards,
Dimitar
Progress Telerik
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