openField won't select all text but Rev reference says it should

[runrev at jkvaldez.com]

The built-in rev dictionary says you can select the entire text in a field
by:

on openField
  select text of the target
end openField

This doesn't work for me. I create a new stack, drag out a scrolling text
field, enter the above handler/script. It works only if I tab into the
fld. But if I click it, I can see it briefly hilite the text but then
immediately set the insertion point where I clicked--so no selected text.

I'm using OSX 10.3, rev 2.5. I didn't see anything in bugzilla or posted
in the list. Anyone experiencing this?