As far as I know, there is no way to retrieve the text length when using [i]Autotext[/i] values. If you go into the code and change it to [i]Requests[/i] you will then be able to do a follow up request for the length which can then be plugged into the textbox size.
AC18-23 AUS 4006
Self-taught, bend it till it breaks.
Win7 | E5620 x 2 | 24GB | K2200