Hello Madhu,
The text that is shown in the InsertSymbolDialog at the position marked in the screenshot is calculated in the following way:
As you can see, the "Uppercase Letter" text comes from the localization resources. You can find more about localization of
RadRichTextBox - mechanisms, localization keys, etc in
this article.
If the customization you can do through localization is not sufficient, you can create your own implementation of this window. This is done by implementing the
IInsertSymbolWindow interface and marking your user control with the
[CustomInsertSymbolWindow] attribute.
Greetings,
Iva Toteva
the Telerik team
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