Hi Maximiliaan,
Thank you for contacting Syncfusion support,
Based on the provided information, we suspect that you would like to have menu list which shows the list of PDF documents. Whenever the user clicks the particular list item, it should open the PDF document in PDFViewer control and leaving the PDFViewer should navigate to the menu page. We have created a simple sample which helps your scenario,
Please find the sample in the below link,
Please try the above provided sample and let us know it has resolved your issue.
If our understanding is different from your requirement, could you please explain elaborately about your requirement? It will be useful for us to investigate further on this and assist you with a better solution at the earliest.
Regards,
Ashok Kumar Viswanathan.