empty ask result + ok = result:cancel

[MisterX]

im implementing a nice search and replace function and well, check it out...
 
local lselection

on mouseenter
  put "viewbar" into f
  get the selectedtext of fld f
 put it into lselection
  end if
end mouseenter

on mouseUp
  local f,x,y,txt
  
  put "viewbar" into f
  put fld f into txt
  
  ask "Replace what:" with lselection
  put it into x
  get the result
  if it is "cancel" then exit mouseup
  ask "Replace with:" with it
  put it into y
  get the result
  if it is "cancel" then exit mouseup
  
  replace x with y in fld f
end mouseup

Now, if i want to replace x with nothing, i leave the second ask
empty but the result, despite clicking OK, is "Cancel"... grrr

Can any of you replicate this?
bugzilla or is it me?

TIA
cheers
Xavier