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 %OBJ%:W_AI_LENGHT contains the number of the last element to display
   on a listbox array.

 If the object current is a listbox array,  and the array is to be displayed
 and contains 3 elements in %OBJ%:W_AI_LENGHT with the value value of 3.

 If for the following manipulations of the array to be displayed the length
 must be edited by be the programmer the change of the value.

 If for instance the preceding array must changed from 3 to 6 elements
 it must be modified %OBJ%:W_AI_LENGHT change it to 6

 %OBJ%:W_AI_LENGHT:= 6