More TopStack-DefaultStack Mysterious - TraveralOn (false) Selection lost?

[Brahmanathaswami]

7.1.rc 1

  I could have sworn this used to work:

make stack # Call it no. 1 "utilities"
create button
set traversalON of the button to "false"

on mouseUp
    set the defaultstack to the topStack
    put  selectedChunk()
end mouseUp

set stack 1 to palette mode.

go to stack 2 with text in a field selected

in the utilities stack... click the button:  even though the traversal 
is set to false for the button the text selection in the top stack field 
is lost /de-selected result

char 1 to 0 of fld 1

??

BR