How do I use RichEdit 4.1?
Another thing I didn't talk about in my article was how to make sure your rich text edit controls are based on RichEdit 4.1 (which has TSF support).
You need to do two things:
1) change your window class name from RICHEDIT_CLASS to MSFTEDIT_CLASS, and
2) LoadLibrary("msftedit.dll") instead of LoadLibrary("richedit.dll").