Only create single instance of the PackageManagementService.

src/AddIns/Misc/PackageManagement/Project/PackageManagement.csproj

@@ -137,6 +137,7 @@
     <Compile Include="Src\RegisteredPackageSource.cs" />
     <Compile Include="Src\RegisteredPackageSources.cs" />
     <Compile Include="Src\SelectedListBoxItemScrollingBehaviour.cs" />
+    <Compile Include="Src\ServiceLocator.cs" />
     <Compile Include="Src\SharpDevelopPackageManager.cs" />
     <Compile Include="Src\SharpDevelopPackageManagerFactory.cs" />
     <Compile Include="Src\SharpDevelopPackageRepositoryFactory.cs" />

src/AddIns/Misc/PackageManagement/Project/Src/ServiceLocator.cs

@@ -0,0 +1,16 @@
+// Copyright (c) AlphaSierraPapa for the SharpDevelop Team (for details please see \doc\copyright.txt)
+// This code is distributed under the GNU LGPL (for details please see \doc\license.txt)
+
+using System;
+
+namespace ICSharpCode.PackageManagement
+{
+	public class ServiceLocator
+	{
+		static readonly PackageManagementService packageManagementService = new PackageManagementService();
+		
+		public static IPackageManagementService PackageManagementService {
+			get { return packageManagementService; }
+		}
+	}
+}

src/AddIns/Misc/PackageManagement/Project/Src/ViewModelLocator.cs

@@ -33,7 +33,7 @@ namespace ICSharpCode.PackageManagement
 				if (IsInDesignMode()) {
 					packageManagementService = new DesignTimePackageManagementService();
 				}
-				packageManagementService = new PackageManagementService();
+				packageManagementService = ServiceLocator.PackageManagementService;
 			}
 		}