Using Blixt scrollbar with Auto height Textfield

Can anyone help me figure out what I’m doing wrong here? I want to use a Blixt’s scrollbar to scroll a dynamic textfield that’s is set to a autosizing height…

And I’m having problems. I though I had finally found my perfect scrollbar… it’s so close!

sorry about the filename, I was really frustrated…

If you’ve used Blixt’s scrollbar before…help me out!