I am a little annoyed of this control even though it has a lot of good functionality. I have tried to use it in our grand application and had some issues going to a specific page after the document has loaded and I have created a sample project for you. A little issue there was that I couldn't see the control before I selected a telerik theme. Very frustrating!
I have tried a million different ways of loading the document and waiting for it to load, using timers, the events and other weird work arounds. Nothing worked until I tried the demo project with the code Kammen suggested, which I also tested in the other application, without luck.
It turns out, the problem is because I had the control inside another control, in my case a radtabcontrol. It works as long it's in the first tabitem, or in other words, the tab in focus, when it's loaded.
If I put it in another tab when it loads, then the page command is ignored event though the event is triggered. It doesn't
matter whether I use "GotoPage(10)" or "CurrentPageNumber = 10"
I would have attached the sample project if I could, but only pics are allowed. I will send it in a support ticket instead.