ole function between oracle developper 2000 ole2 package and Excel 97

I want to change the Calculation property of excel sheet to Manual value and Automatic value via oracle ole2 package in forms 4.5. I already create ole2 object and I'm able to change sheetsinworksheet property with
ole2.set_property(global.application,'sheetsinworksheet',4) I want to use the same function to change Calculation value. ole2.set_property(global.application,'Calculation','xlmanual' or ???) This is the problem, the value of Calculation property doesn't seem work.

Thank for all solutions of my problem.

              nicolas.rancourt_at_sympatico.ca
    
                     Le Groupe Progestic
         Conseillers en gestion et en informatique
             http://www.groupe-progestic.com


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