Presently, you can only set the text for the control directly, which will result in the valid symbols being rendered in accordance with the encoding. Other than this, you cannot add symbols to the code. If you would like, you could reduce the dimensions of the control.
With respect to the PDFViewer problem which you mentioned - to properly address the issue at hand, it will be best if you open a formal support ticket, and send us a small working project, demonstrating your setup, and showing the unwanted behavior. We will debug it locally, and advise you further.
the Telerik team
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