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   put the topLeft  of me into tsavedTopLeft // it the button that launches the substack. Can be any other object on the card.
   put item 1 of  tsavedTopLeft into tLeftMeCoordinate
   put item 2 of  tsavedTopLeft into tTopMeCoordinate
   put the TopLeft of this stack into tStackLocation
   put item 1 of  tStackLocation into tLeftCoordinate
   put item 2 of  tStackLocation into tTopCoordinate
   put -180 into tMoveLeftRight// This positions the SubStack hor-coordinate relative to the object (button that launches the substack in this case)
   put -100 into tMoveUpDown // This positions the SubStack vert-coordinate relative to the object (button that launches the substack in this case)
   add tTopMeCoordinate+tMoveUpDown to tTopCoordinate
   add tLeftMeCoordinate+tMoveLeftRight to tLeftCoordinate
   put tLeftCoordinate&","&tTopCoordinate into tSubStackLocation
   open invisible stack "theSubStackName"
   set the topLeft of stack "theSubStackName" to tSubStackLocation
   set the visible of stack "theSubStackName" to true

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...
## Use SCREEN coordinates directly!
put globalloc(the topLeft of me) into tsavedTopLeft

## Add H and V offset
add 180 to item 1 of tsavedTopLeft
add 100 to item 2 of tsavedTopLeft

## Set loc of substack, no need to open it invisible before!
set the topLeft of stack "theSubStackName" to tsavedTopLeft
go stack "theSubStackName"
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   set the left of stack "subStack" to the right of stack "mainStack + 10
   set the top of stack "subStack" to the top of stack "mainStack"