The object get from PdfDocument.Pages[0] is PdfNewPage starts from Spire.PDF V3.5

When use method Section.Pages.Add() to add the new pages for the PDF file and use the method PdfDocument.Pages[0] to get the page object, the object has been changed to PdfNewPage instead of PdfPageWidget starts from Spire.PDF V3.5.

If use the method PdfDocument.Pages.Add() to add the new page, the page object gets from the method PdfDocument.Pages[0] is also PdfNewPage with the same as the previous versions of Spire.PDF.

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