MouseLeave puzzle

[Jim Hurley]

I have a field script:

on mouseUP

  if there is no graphic "arrow" then
    set the style of the templateGraphic to "line"
    set the endarrow of the templateGraphic to true
    set the lineSize of the templateGraphic  to  2
    create graphic "arrow"
  end if
  put the mouseLoc into line 1 of tGraphicPoints
  put the clicktext into whatText
 switch whatText
  case "objective lens"
    put 869,217 into line 2 of tGraphicPoints
    break
  case "ocular lens"
    put 545,263 into line 2 of tGraphicPoints
    break
  case "focal point"
    put 435,327 into line 2 of tGraphicPoints
    break
  default
    put "" into line 2 of tGraphicPoints
    break
  end switch
  set the points of graphic "arrow" to tGraphicPoints --Draw the arrow
  wait 1 sec
end mouseUp
on mouseLeave
  set the points of graphic "arrow" to ""
end mouseLeave
The puzzle is that the arrow shows for 1 second and then disappears, 
even when the mouse is never moved away from the clickText, much less 
out of the field. (The word pairs are linked.)

Why is the "mouseLeave" message being send?

Jim
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