diff --git a/src/AddIns/Misc/PackageManagement/Project/Src/EnvDTE/Property.cs b/src/AddIns/Misc/PackageManagement/Project/Src/EnvDTE/Property.cs
index bea0ece72b..4dcbc5fda7 100644
--- a/src/AddIns/Misc/PackageManagement/Project/Src/EnvDTE/Property.cs
+++ b/src/AddIns/Misc/PackageManagement/Project/Src/EnvDTE/Property.cs
@@ -8,13 +8,20 @@ namespace ICSharpCode.PackageManagement.EnvDTE
 {
 	public class Property
 	{
+		IPackageManagementProjectService projectService;
 		MSBuildBasedProject project;
 		string name;
 		
 		public Property(MSBuildBasedProject project, string name)
+			: this(project, name, new PackageManagementProjectService())
+		{
+		}
+		
+		public Property(MSBuildBasedProject project, string name, IPackageManagementProjectService projectService)
 		{
 			this.project = project;
 			this.name = name;
+			this.projectService = projectService;
 		}
 		
 		public object Value {
@@ -22,7 +29,13 @@ namespace ICSharpCode.PackageManagement.EnvDTE
 			set {
 				bool escapeValue = false;
 				project.SetProperty(name, value as string, escapeValue);
+				SaveProject();
 			}
 		}
+		
+		void SaveProject()
+		{
+			projectService.Save(project);
+		}
 	}
 }
diff --git a/src/AddIns/Misc/PackageManagement/Project/Src/EnvDTE/References.cs b/src/AddIns/Misc/PackageManagement/Project/Src/EnvDTE/References.cs
index 976210f946..9f5df2994c 100644
--- a/src/AddIns/Misc/PackageManagement/Project/Src/EnvDTE/References.cs
+++ b/src/AddIns/Misc/PackageManagement/Project/Src/EnvDTE/References.cs
@@ -28,6 +28,12 @@ namespace ICSharpCode.PackageManagement.EnvDTE
 		{
 			var referenceItem = new ReferenceProjectItem(project, path);
 			projectService.AddProjectItem(project, referenceItem);
+			SaveProject();
+		}
+		
+		void SaveProject()
+		{
+			projectService.Save(project);
 		}
 	}
 }
diff --git a/src/AddIns/Misc/PackageManagement/Test/Src/EnvDTE/ProjectTests.cs b/src/AddIns/Misc/PackageManagement/Test/Src/EnvDTE/ProjectTests.cs
index 9882ff2613..a7e2abd1c1 100644
--- a/src/AddIns/Misc/PackageManagement/Test/Src/EnvDTE/ProjectTests.cs
+++ b/src/AddIns/Misc/PackageManagement/Test/Src/EnvDTE/ProjectTests.cs
@@ -33,6 +33,17 @@ namespace PackageManagement.Tests.EnvDTE
 			Assert.AreEqual("System.Data", referenceName);
 		}
 		
+		[Test]
+		public void ObjectReferencesAdd_AddGacAssemblyReference_MSBuildProjectIsSaved()
+		{
+			CreateProject();
+			project.Object.References.Add("System.Xml");
+			
+			bool saved = msbuildProject.IsSaved;
+			
+			Assert.IsTrue(saved);
+		}
+		
 		[Test]
 		public void PropertiesItemValue_GetPostBuildEvent_ReturnsProjectsPostBuildEvent()
 		{
@@ -64,5 +75,16 @@ namespace PackageManagement.Tests.EnvDTE
 			
 			Assert.AreEqual("$(SolutionDir)", postBuildEventProperty);
 		}
+		
+		[Test]
+		public void PropertiesItemValue_SetPostBuildEvent_MSBuildProjectIsSaved()
+		{
+			CreateProject();
+			project.Properties.Item("PostBuildEvent").Value = "test";
+			
+			bool saved = msbuildProject.IsSaved;
+			
+			Assert.IsTrue(saved);
+		}
 	}
 }