Scrolling text box issues

I'm encountering some strange behavior with a button in a scrolling popup text box (not initially visible, white background, always on top).The button is to close the text box (hide when clicked), and I positioned it at the bottom of the text box.The problem is, when you first show the text box, the button appears in the upper left-hand corner. As you scroll, it jumps down to the bottom (where it's supposed to be). If you then scroll the text up and down, it stays at the bottom.I'm also having problems with a handful of characters out of the middle of a line of text remaining on-screen as you scroll down. The result is these misplaced characters appearing over top of the text that's displayed at the bottom.Any suggestions or help to fix either or both would be MOST appreciated.

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