Setting the vertical scroll bar/cursor in a PtMultiText Widg

I am using a PtMultiText Widget to display a log file that is being updated every 500 milliseconds. Most of the time I want the log to be scrolled to the bottom last line entry, but if a user wants to look at prior entries I don’t want the log to be auto scrolling to the last entry. I have tried several things to try to stop the PtMultiText box from either scrolling to the top or the bottom, depending on if I have disabled the Pt_ARG_SCROLL_TO_CURSOR flag. I have also tried manually setting the cursor position. Does anyone have a suggestion?

I have figured out all my other obsticals, but this could be a show stopper.