based on the image, it should be there. open the reference.cs file for a service that does not appear in IntelliSense, and check the namespace. Then try to create the link using the full name. To go to the reference.cs file, click Show All Files In Solution Explorer, as shown below.

for example, if in reference.cs you see the namespace WWWCF.UserRegistrationas foo.bar.WWWCF.UserRegistration, then create an instance using
foo.bar.WWWCF.UserRegistration ref = new foo.bar.WWWCF.UserRegistration ();
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