When I have entered a custom calculation script for a form field and accidentally click one of the other options in that tab or accidentally click to the Validate tab, my whole script just disappears, which is infuriating. Why can you not just leave the script there as is, but obviously don't apply it if another option is clicked. Perhaps a user would like to test different Calculation/Validation options without having their work erased. I am so sick of losing hours of work simply because I mis-clicked.