Thank you for the follow up. Actually there is indeed a bug in the official version and the event is not fired.
We have prepared a demo application that shows how you can get the Loaded event when the other document is opened. For the demo to work, you should use and internal build prepared after the service pack, for example the 2012.1.528 version of the DLLs. You can download internal builds from your account.
Here is an explanation of the memory
1. When you are using the ReadOnDemand mode, the DocumentSource keeps the stream (file) opened for reading. That is why you cannot open it again.
3. RadPdfViewer caches some data in order to be faster. Therefore sometimes (for example when the PDF file contains big images) or the files are big, the consumed memory can rise. However, all the memory will be freed once it is no longer used.
the Telerik team
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