Nothing special is needed, it is built into Reflector, albeit not very discoverable. Right-click the assembly in the left pane and choose Export. You'll get a chance to change the output directory. Click OK and Reflector starts decompiling the code, creating a source file for each individual class. And creates a .csproj file which you can open in Visual Studio.
与恶龙缠斗过久,自身亦成为恶龙;凝视深渊过久,深渊将回以凝视…