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In order to highlight the selected text, you can use the ChangeFontHighlightColorCommand. However keep in mind that you need to pass as argument a color instance locate in the following namespace: Telerik.WinControls.RichTextEditor.UI.Color. Please refer to the code snippet below:
sender, EventArgs e)
.radRichTextEditor1.Commands.ChangeFontHighlightColorCommand.Execute(Telerik.WinControls.RichTextEditor.UI.Color.FromRgb(21, 135, 173));
In addition, more information about can be found: RichTextEditor >> Features >> Selection
and RichTextEditor >> Features >> Commands
Finally, I can suggest using the built-in Selection Mini Toolbar
which is a floating toolbar with the most commonly used commands for formatting text.
Please, let me know if there is something else I can help you with.
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