Gets all the Page objects
under this node and descendents of this node. The pages are
returned in order of page number. The Page.ID can be
assigned directly to the Doc.Page property
to set the focus to a particular page. For large or badly
structured documents it is likely to be faster to use this type of
operation than it is to repeatedly access the Doc.PageNumber
For an array of the immediate children of this node see GetPageArray.