Expression Blend 3 with SketchFlow

I have been trying to learn how to use SketchFlow and Blend 3 to create a Silverlight application but I have run into a frustrating problem. When I create a screen the program automatically names it screen1 and creates the xaml and xaml.cs file with this name. If I build the application prior to renaming it, it works as I would expect. If I rename it changing the class and xaml files the page will not launch. If I rename it back to the previous name screen_1 (in the xaml and xaml.cs) file it works again. Anyone know what going on?