Value 

Meaning 

tfAutoText  

The control attempts to determine whether Text contains rich text. If a valid tag is seen on the first line, Text is assumed to be a rich text document. Otherwise, Text is displayed as plain text.  

tfText  

The control assumes that Text contains rich text, even if no tags are present. Note that in rich text, any sequence consisting entirely of spaces, tabs, and line breaks counts as a single space.  

tfPlainText  

The control assumes that Text contains plain text.