There's something wrong with some of Microsoft's document controls and some versions of the XAML editor so they give this sort of error. I asked them about it and they didn't seem too concerned by it all. I don't think the believe many people will be using these document objects and controls. (I also think some of the other document controls work better, although I can't remember which were the ones that worked and which gave problems right now.)
You may get a better result by using Blend.
Can you execute the program? I think I recall that sometimes the program wouldn't load in the XAML editor but would run just fine.
In cases like those, you have a couple choices:
- Get the interface all set up without the control, add it at the end, and then not edit the interface in the designer after that.
- Edit the interface in XAML and not use the editor.
- Get the interface all set up without the control and create the control at run time.
Sorry this isn't a great answer. I don't think Microsoft is going to help much with this issue so it's more a question of working around the problem rather than fixing it.
Xaml Error Code in documentviewer section (page 79-80)
