fix outdated property reference in Shell prototype
fix outdated property reference in Shell prototype
ghemingway/cad.js,metamorph-inc/cad.js,ghemingway/cad.js,steptools/StepNCViewer,metamorph-inc/cad.js,metamorph-inc/cad.js,steptools/NC.js,steptools/NC.js,steptools/StepNCViewer,steptools/NC.js,steptools/StepNCViewer,ghemingway/cad.js