title: Creating a Workbook with a custom name without saving it to disk
body: <p>Is it possible to create a Workbook with a custom name without saving it to disk? I want to avoid the default "Workbook x" names but I don't want to require the user to save the workbook. If I save it automatically in some temporary, the user won't get the "Save As..." dialog if he clicks on "Save", which may be confusing.</p>