Greetings,

I am very new to mapping, but I've gotten a pretty good understanding of the basics from the "StartupSolution" sample.  I'm trying to emulate the exact same code used in the SetDefaultLocation() method in the GeometryBinding.xaml.cs file.  However, when I load my page, I get the following error:

"Cannot create viewport matrix"

It's happening at the following line of code:

theMap.WindowRect = theMap.WorldRect = winRect;

 I'm stumped. The only difference between my code and the code in the sample is taht I am using this in my main page, rather than navigating to it frmo another page.

Any ideas?

Thanks in advance.