Shader debugging

So I search msdn for how to debug my shaders and come to this page: http://msdn.microsoft.com/en-us/library/bb147364(VS.85).aspx which says, Microsoft Visual Studio .NET supports debugging assembly-level and high-level language vertex and pixel shaders and effects using the DirectX Extensions for Visual Studio .NET (the shader debugger)." I then look for where to download "DirectX Extensions for Visual Studio .NET" and come up with nothing. There doesn't appear to be any such thing. So, how exactly do I go about setting a breakpoint in my shader code and examining the value of a shader variable? Why is MSDN so friggin out of date/lacking with all information as it pertains to DX 10? It keeps referring to DX9 documents, some of which list interfaces or files that aren't in dx 10. I assume this is one of those cases with deprecated information. Does MS just plain not care about thier C++ API anymore? Why bother making a graphics API with such poor documentation?