Creates and loads a new empty workbook.
true if the document is created successfully; otherwise, false.
If the WorkbookEventOptions.RaiseOnModificationsViaAPI property is set to true and the SpreadsheetControl’s document has unsaved changes (the SpreadsheetControl.Modified property is true), the CreateNewDocument method call raises the SpreadsheetControl.DocumentClosing event.
Set e.Cancel to true in the SpreadsheetControl.DocumentClosing event handler to prevent a document from closing. In this case, the CreateNewDocument method returns false.
If the new document was created and successfully loaded, the CreateNewDocument method returns true.