How to debug Visual Studio 2012 instance design-time

Question

I\'m developing a WPF MarkupExtension and encountered errors during design time. With the previous version of Visual Studio 2010 it was possible to start a second instance o

Answer 1

The process is called XDesProc, and it is created with each new Preview Window. Therefor: to debug a preview window, open a second instance of Visual Studio 2012 with the same solution, set your breakpoints and attach to XDesProc. It's recommended to have only one preview window open to attach to the right process. Otherwise use Process Explorer to find the correct process.