How can I retreive (and select) ONLY the top line in a rich text edit box?

In a regular edit box you can just use mline, but this does not seem to work in a rich text edit box accurately, due to non fixed width line of text (of course). I need to do a line by line scan based on only what is in shown in the window in a rich text edit box control on a form.

I tried setting the position in the RTF box then using KEYBOARD '{SHIFT + END}', but windows 7 has issues with this I think, and I would like to do this a better way anyway.

So in short I need a guaranteed way to retrieve only the first line of text in a rich text edit box, then only the second, then third etc.

Thanks again in advance!!

BC