Currently, there is no command/API for RadRichTextBox that changes the case of the current selection. As you already found out, the feature is in our to-do list, but has not been scheduled for implementation yet. I could suggest you to follow the item
in order to get notifications about any related changes.
However, I've created a sample project which demonstrates how this functionality could be achieved with a custom command. In the example, executing the custom ToggleCaseRoutedCommand
(with hotkey Shift+F3), changes the text case to upper. You can find it attached.
Please get back to us if you have further assistance.
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