AutoCAD 2010/2011/2012 DWG Format

[#1]

I'm doing new titleblocks for our office.

Is there a way to constrain a few objects to an attribute text box width?    I want the background box and line to stretch, based on what is typed in that attribute box.

I know that if I make the attribute, a multi-line attribute, I can add a backgroud mask.  I don't want to take this route, because the mask boundary varies, depending on what character is typed.  Also, there is a gap between the mask and line I would like to maintain.

I tried some constraint stuff, but all I seem to be able to constrain is the insertion point of the text box, and not the width grip...

Any help would be greatly appreciated.

Thank you.

[#2]

I guess what I'm trying to do here is to constrain objects to a text node (not the insertion point)... is that possible?

Whenever I select the horizontal constraint and want to select the node it tells me "invalid point" (i specified snap to node)...

Would a lisp routine help me with this?  If so, is it going to work on the seats that have AutoCAD LT installed?