Implement Reference.Path property.

src/AddIns/Misc/PackageManagement/Project/Src/EnvDTE/Reference.cs

@@ -21,6 +21,10 @@ namespace ICSharpCode.PackageManagement.EnvDTE
 			get { return referenceProjectItem.Name; }
 		}
 		
+		public string Path {
+			get { return referenceProjectItem.FileName; }
+		}
+		
 		public void Remove()
 		{
 			project.RemoveReference(referenceProjectItem);

src/AddIns/Misc/PackageManagement/Test/Src/EnvDTE/Reference3Tests.cs

@@ -17,12 +17,13 @@ namespace PackageManagement.Tests.EnvDTE
 		TestableProject msbuildProject;
 		FakePackageManagementProjectService fakeProjectService;
 		TestableDTEProject project;
+		ReferenceProjectItem referenceProjectItem;
 		
 		void CreateReference(string name)
 		{
 			project = new TestableDTEProject();
 			msbuildProject = project.TestableProject;
-			ReferenceProjectItem referenceProjectItem = msbuildProject.AddReference(name);
+			referenceProjectItem = msbuildProject.AddReference(name);
 			fakeProjectService = project.FakeProjectService;
 			CreateReference(project, referenceProjectItem);
 		}
@@ -106,5 +107,16 @@ namespace PackageManagement.Tests.EnvDTE
 			
 			Assert.IsFalse(result);
 		}
+		
+		[Test]
+		public void Path_SystemXmlReferenceInProjectReferences_ReturnsFullPathToSystemXml()
+		{
+			CreateReference("System.Xml");
+			referenceProjectItem.FileName = @"c:\Program Files\Microsoft\Reference Assemblies\v4\System.Xml.dll";
+			
+			string path = reference.Path;
+			
+			Assert.AreEqual(@"c:\Program Files\Microsoft\Reference Assemblies\v4\System.Xml.dll", path);
+		}
 	}
 }