The RTF control was designed to be manipulated via SelectionStart
and SelectionLength
properties, followed by rtf attributes, such as SelectionColor = yada-yada-yada
. To manipulate the RTF data would require parsing the RTF string property, and that is fraught with difficulties to correctly identify rtf control characters and rtf text, along with keeping the font and color indexes in sync.
The answer to your question is no, you cannot disable the auto-generation of the rtf code from the control.