We've made some changes in the way presenters work in RadPdfViewer since 2012 and you could find more information about them in this article
. Kamen's idea was to use the single page presenter as a way to pass the visuals to the printer since the presenter only shows one page at a time. In terms of code you can use the GoToPage() method to traverse all pages in the document.
As an alternative, if it is suitable for your scenario, you could use the API of RadPdfProcessing, which allows you to merge documents. The idea is to create a single document and use it to print all the documents at once. More information about how to achieve this is available in the RadFixedDocument article for RadPdfProcessing
. Please, note that the RadFixedDocument class isn't completely unified at this point and you may find some differences between the library and the viewer.
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