Add text (please help)

OK, I don't know much API. MS says VB can't add text to an Outlook reply message (this is an RTF or plain text message - not HTML or Word editor), but that's what I need to do. I've figured out how to get the handle for the reply message box, but I can't get to the Body box within it and find out where the cursor is to know where to add text. I've been trying to work this out and searching for weeks and have crashed my PC dozens of times.

Can anyone give me code that can do this (or at least get me close)?