Finding code definitions in VS.NET IDE

How do I find the code its Interfaces copies?  I’m looking at a method however it also has an Interface.  I must use the Find dialog to search the entire solution? 

GoToDefinition

Go To Definition (F12), then it takes me to an interface. Is there a better way to find the functioning class rather than the Interface class?  I know tools like Resharper, etc makes it easier…