Update line values on sales quote whenever header is updated


    When i change the dimensions or sales tax on sales quotation header and if i switch to lines, then I will get a prompt(salesquotationlineprompt) asking whether to update dimension or sales tax even on lines. So here basically my client want me to have the check boxes checked by default whenever this prompt opens. I tried debugging the class sales quotation line to prompt to find where these check boxes coded,but still no luck at this point.   So can anybody please guide me with this?

Thanks for your help...