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on mouseUp
   ## Get the datagrid data, which is an array:
   put the dgdata of grp "your datagrid here" into tData
   
   ## We use the KEYS of that array (1 to N), which is a CR delimited list, for the following loop
   put the keys of tData into tKeys
   
   ## we use tis variable for the text list:
   put empty into tTextList
   
   ## here we create a simple (test) TAB and CR delimited list from the array data
   repeat for each line tKey in tKeys
      put tData[tKey]["column 1"] & TAB & tData[tKey]["column 2"] & TAB & tData[tKey]["column 3"] & CR after tTextList
   end repeat
   
   ## get rid of trailing CR
   delete char -1 of tTextList
   
   ## Now display list in a field
   put tTextList into fld "whatever"
   
end mouseUp