Thank you for your interest in RadRichTextBox!
The most common reason for the dialogs not showing is because of missing needed DLL references.
Please, be aware that the default implementation of the dialogs is related to Telerik.Windows.Documents.RadRichTextBoxUI.dll and make sure all required references
are added in your project.
If you are still experiencing problems, would it be possible to create a sample working project and send it to us through a support ticket? This will be the fastest way to investigate the problem and try to provide a solution.
I hope this helps! Let me know how it goes.
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