Blend “Window is not supported in a WPF Project”

Question

I am having a frustrating time with Blend reporting \"Window is not supported in a Windows Presentation Foundation (WPF) project.\" due to unbuildable configurations but can\'t

Answer 1

I came across this issue with VS2010 and Blend4. Suddenly my project would not render in Blend.

The issue was that a developer on our team setup Custom Build Configurations. When he did this he removed Debug. Once i added Debug back to the build configuration Blend was happy again.