Understanding the long ID?

[Chipp Walters]

I'm using the latest release of Rev 2.8.1

I create a new stack, add a single fld and a single button. In the button
script I add:

on mouseUp
  put the long ID of fld 1 into tID
  set the disabled of tID to not the disabled of tID
  put "fred" into tID
end mouseUp

When I press it, the field becomes disabled alternately (as expected). The
disabled is only here to show that tID is referenced correctly.

But, "fred" never gets put in the field? I wonder why? Is this a bug?

BTW, this does work:

set the text of tID to "fred"

hmmmmm.