Today when I opened a Demo Project, I found the VS was diferent from usual.
So which setting can make the Document Outline window act like this?
My environment:
VS2010 SP1
Blend4 SP1
Win7

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I found it out by myself. This because I have installed Visual Studio 11 Developer Preview. It changed the default program to open vs solution file. So the pic shown above is not vs10, it’s vs11!