diff --git a/src/AddIns/Misc/PackageManagement/Project/Src/EnvDTE/FileProjectItemExtensions.cs b/src/AddIns/Misc/PackageManagement/Project/Src/EnvDTE/FileProjectItemExtensions.cs
index a685092279..ca9941192b 100644
--- a/src/AddIns/Misc/PackageManagement/Project/Src/EnvDTE/FileProjectItemExtensions.cs
+++ b/src/AddIns/Misc/PackageManagement/Project/Src/EnvDTE/FileProjectItemExtensions.cs
@@ -2,6 +2,8 @@
 // This code is distributed under the GNU LGPL (for details please see \doc\license.txt)
 
 using System;
+using System.IO;
+using ICSharpCode.Core;
 using ICSharpCode.SharpDevelop.Project;
 
 namespace ICSharpCode.PackageManagement.EnvDTE
@@ -17,5 +19,16 @@ namespace ICSharpCode.PackageManagement.EnvDTE
 		{
 			return projectItem.DependentUpon == otherProjectItem.Include;
 		}
+		
+		public static bool IsDependentUponFileName(this FileProjectItem projectItem, string fileName)
+		{
+			return FileUtility.IsEqualFileName(projectItem.GetDependentUponFileName(), fileName);
+		}
+		
+		public static string GetDependentUponFileName(this FileProjectItem projectItem)
+		{
+			string directory = Path.GetDirectoryName(projectItem.FileName);
+			return Path.Combine(directory, projectItem.DependentUpon);
+		}
 	}
 }
diff --git a/src/AddIns/Misc/PackageManagement/Project/Src/UpdateProjectBrowserFileNodesVisitor.cs b/src/AddIns/Misc/PackageManagement/Project/Src/UpdateProjectBrowserFileNodesVisitor.cs
index 2c67688086..12edaef7a8 100644
--- a/src/AddIns/Misc/PackageManagement/Project/Src/UpdateProjectBrowserFileNodesVisitor.cs
+++ b/src/AddIns/Misc/PackageManagement/Project/Src/UpdateProjectBrowserFileNodesVisitor.cs
@@ -10,6 +10,7 @@ using System.Windows.Forms;
 using ICSharpCode.Core;
 using ICSharpCode.SharpDevelop.Gui;
 using ICSharpCode.SharpDevelop.Project;
+using DTE = ICSharpCode.PackageManagement.EnvDTE;
 
 namespace ICSharpCode.PackageManagement
 {
@@ -48,7 +49,9 @@ namespace ICSharpCode.PackageManagement
 				return null;
 			
 			if (IsImmediateParentForNewFile(directoryNode)) {
-				if (IsChildFileNodeMissingForNewFile(directoryNode)) {
+				if (IsNewFileIsDependentUponAnotherFile()) {
+					base.Visit(directoryNode, data);
+				} else if (IsChildFileNodeMissingForNewFile(directoryNode)) {
 					AddFileOrDirectoryNodeTo(directoryNode);
 				}
 			} else if (IsChildDirectoryNodeMissingForNewFile(directoryNode)) {
@@ -79,6 +82,11 @@ namespace ICSharpCode.PackageManagement
 			return FileUtility.IsBaseDirectory(DirectoryForNewFileAddedToProject, directoryNode.Directory);
 		}
 		
+		bool IsNewFileIsDependentUponAnotherFile()
+		{
+			return !String.IsNullOrEmpty(newFileAddedToProject.DependentUpon);
+		}
+		
 		string GetDirectoryForFileAddedToProject()
 		{
 			return Path.GetDirectoryName(newFileAddedToProject.FileName);
@@ -121,10 +129,10 @@ namespace ICSharpCode.PackageManagement
 				AddFileNodeTo(directoryNode);
 			}
 		}
-
-		void AddFileNodeTo(TreeNode node)
+		
+		void AddFileNodeTo(TreeNode node, FileNodeStatus status = FileNodeStatus.InProject)
 		{
-			var fileNode = new FileNode(newFileAddedToProject.FileName, FileNodeStatus.InProject);
+			var fileNode = new FileNode(newFileAddedToProject.FileName, status);
 			fileNode.InsertSorted(node);
 		}
 		
@@ -169,5 +177,21 @@ namespace ICSharpCode.PackageManagement
 		{
 			return parentNode.AllNodes.OfType<DirectoryNode>();
 		}
+		
+		public override object Visit(FileNode fileNode, object data)
+		{
+			if (IsNewFileIsDependentUponAnotherFile()) {
+				if (IsImmediateParentForNewFile(fileNode)) {
+					AddFileNodeTo(fileNode, FileNodeStatus.BehindFile);
+					return null;
+				}
+			}
+			return base.Visit(fileNode, data);
+		}
+		
+		bool IsImmediateParentForNewFile(FileNode fileNode)
+		{
+			return DTE.FileProjectItemExtensions.IsDependentUponFileName(newFileAddedToProject, fileNode.FileName);
+		}
 	}
 }
diff --git a/src/AddIns/Misc/PackageManagement/Test/Src/ProjectBrowserUpdaterTests.cs b/src/AddIns/Misc/PackageManagement/Test/Src/ProjectBrowserUpdaterTests.cs
index 3341a49b7a..d56d4dac73 100644
--- a/src/AddIns/Misc/PackageManagement/Test/Src/ProjectBrowserUpdaterTests.cs
+++ b/src/AddIns/Misc/PackageManagement/Test/Src/ProjectBrowserUpdaterTests.cs
@@ -131,6 +131,15 @@ namespace PackageManagement.Tests
 			AddProjectItemToProject(fileProjectItem);
 		}
 		
+		void AddDependentFileToProject(string fileName, string dependentUpon)
+		{
+			var fileProjectItem = new FileProjectItem(project, ItemType.Compile) {
+				FileName = fileName,
+				DependentUpon = dependentUpon
+			};
+			AddProjectItemToProject(fileProjectItem);
+		}
+		
 		void AddReferenceToProject(string name)
 		{
 			var reference = new ReferenceProjectItem(project, name);
@@ -585,5 +594,150 @@ namespace PackageManagement.Tests
 			
 			AssertChildFileNodesCountAreEqual(1, subfolderNode);
 		}
+		
+		[Test]
+		public void Constructor_NewDependentFileAddedWhenParentFileHasNoChildren_DependentFileAddedToParentFile()
+		{
+			string projectFileName = @"d:\projects\MyProject\MyProject.csproj";
+			string fileName = @"d:\projects\MyProject\MainForm.cs";
+			CreateProjectNodeWithOneFileInRootDirectoryExpanded(projectFileName, fileName);
+			string newFileName = @"d:\projects\MyProject\MainForm.Designer.cs";
+			
+			AddDependentFileToProject(newFileName, "MainForm.cs");
+			
+			FileNode mainFormFileNode = GetFirstFileChildNode(projectNode);
+			FileNode mainFormDesignerFileNode = GetFirstFileChildNode(mainFormFileNode);
+			Assert.AreEqual(newFileName, mainFormDesignerFileNode.FileName);
+			Assert.AreEqual(FileNodeStatus.BehindFile, mainFormDesignerFileNode.FileNodeStatus);
+		}
+		
+		[Test]
+		public void Constructor_NewDependentFileAddedWhenParentFileHasNoChildren_FileNotAddedToSameDirectoryAsParentFile()
+		{
+			string projectFileName = @"d:\projects\MyProject\MyProject.csproj";
+			string fileName = @"d:\projects\MyProject\MainForm.cs";
+			CreateProjectNodeWithOneFileInRootDirectoryExpanded(projectFileName, fileName);
+			string newFileName = @"d:\projects\MyProject\MainForm.Designer.cs";
+			
+			AddDependentFileToProject(newFileName, "MainForm.cs");
+			
+			// Should be only two project child nodes.
+			// References + MainForm.cs
+			Assert.AreEqual(2, projectNode.Nodes.Count);
+		}
+		
+		[Test]
+		public void Constructor_ProjectHasFileInProjectAndInSubdirectoryAndNewFileAddedInSubdirectory_NewFileNotAddedAsChildToExistingFile()
+		{
+			CreateExpandedProjectNodeWithFiles(
+				@"d:\projects\MyProject\MyProject.csproj",
+				@"d:\projects\MyProject\a.cs",
+				@"d:\projects\MyProject\src\b.cs");
+			DirectoryNode srcDirectoryNode = GetFirstDirectoryChildNode(projectNode);
+			srcDirectoryNode.Expanding();
+			
+			AddFileToProject(@"d:\projects\MyProject\src\c.cs");
+			
+			FileNode firstFileNode = GetFirstFileChildNode(projectNode);
+			Assert.AreEqual(0, firstFileNode.Nodes.Count);
+		}
+		
+		[Test]
+		public void Constructor_ProjectHasThreeFilesAndDependentFileAddedToSecondFile_DependentFileAddedToSecondFile()
+		{
+			CreateExpandedProjectNodeWithFiles(
+				@"d:\projects\MyProject\MyProject.csproj",
+				@"d:\projects\MyProject\A.cs",
+				@"d:\projects\MyProject\MainForm.cs",
+				@"d:\projects\MyProject\Z.cs");
+			
+			AddDependentFileToProject(@"d:\projects\MyProject\MainForm.Designer.cs", "MainForm.cs");
+			
+			FileNode mainFormFileNode = GetFirstChildNode(projectNode, n => n.Text == "MainForm.cs") as FileNode;
+			FileNode mainFormDesignerFileNode = GetFirstFileChildNode(mainFormFileNode);
+			Assert.AreEqual(@"d:\projects\MyProject\MainForm.Designer.cs", mainFormDesignerFileNode.FileName);
+		}
+		
+		[Test]
+		public void Constructor_ProjectHasThreeFilesAndDependentFileAddedToSecondFile_DependentFileNotAddedToFirst()
+		{
+			CreateExpandedProjectNodeWithFiles(
+				@"d:\projects\MyProject\MyProject.csproj",
+				@"d:\projects\MyProject\A.cs",
+				@"d:\projects\MyProject\MainForm.cs",
+				@"d:\projects\MyProject\Z.cs");
+			
+			AddDependentFileToProject(@"d:\projects\MyProject\MainForm.Designer.cs", "MainForm.cs");
+			
+			FileNode fileNode = GetFirstFileChildNode(projectNode);
+			Assert.AreEqual(0, fileNode.Nodes.Count);
+		}
+		
+		[Test]
+		public void Constructor_ProjectHasOneFileAndDependentFileAddedWithDifferentCaseToParentFile_DependentFileAddedToParentFile()
+		{
+			CreateExpandedProjectNodeWithFiles(
+				@"d:\projects\MyProject\MyProject.csproj",
+				@"d:\projects\MyProject\MainForm.cs");
+			
+			AddDependentFileToProject(@"d:\projects\MyProject\MainForm.Designer.cs", "MAINFORM.CS");
+			
+			FileNode mainFormFileNode = GetFirstFileChildNode(projectNode);
+			FileNode mainFormDesignerFileNode = GetFirstFileChildNode(mainFormFileNode);
+			Assert.AreEqual(@"d:\projects\MyProject\MainForm.Designer.cs", mainFormDesignerFileNode.FileName);
+		}
+		
+		[Test]
+		public void Constructor_DependentFileAddedWhenProjectHasTwoFilesWithSameParentNameButInDifferentFolders_DependentFileNotAddedToFileInDifferentDirectoryWithSameDependentName()
+		{
+			CreateExpandedProjectNodeWithFiles(
+				@"d:\projects\MyProject\MyProject.csproj",
+				@"d:\projects\MyProject\a.cs",
+				@"d:\projects\MyProject\src\a.cs",
+				@"d:\projects\MyProject\src\b.cs");
+			DirectoryNode srcDirectoryNode = GetFirstDirectoryChildNode(projectNode);
+			srcDirectoryNode.Expanding();
+			
+			AddDependentFileToProject(@"d:\projects\MyProject\src\c.cs", "a.cs");
+			
+			FileNode firstFileNode = GetFirstFileChildNode(projectNode);
+			Assert.AreEqual(0, firstFileNode.Nodes.Count);
+		}
+		
+		[Test]
+		public void Constructor_DependentFileAddedWhenProjectHasTwoFilesWithSameParentNameButInDifferentFolders_DependentFileAddedToFileInSameDirectory()
+		{
+			CreateExpandedProjectNodeWithFiles(
+				@"d:\projects\MyProject\MyProject.csproj",
+				@"d:\projects\MyProject\a.cs",
+				@"d:\projects\MyProject\src\a.cs",
+				@"d:\projects\MyProject\src\b.cs");
+			DirectoryNode srcDirectoryNode = GetFirstDirectoryChildNode(projectNode);
+			srcDirectoryNode.Expanding();
+			
+			AddDependentFileToProject(@"d:\projects\MyProject\src\c.cs", "a.cs");
+			
+			FileNode fileNode = GetFirstFileChildNode(srcDirectoryNode);
+			FileNode childNode = GetFirstFileChildNode(fileNode);
+			Assert.AreEqual(@"d:\projects\MyProject\src\c.cs", childNode.FileName);
+		}
+		
+		[Test]
+		public void Constructor_DependentFileAddedWhenProjectHasTwoFilesWithSameParentNameButInDifferentFoldersAndFolderCasingDifferent_DependentFileAddedToFileInSameDirectory()
+		{
+			CreateExpandedProjectNodeWithFiles(
+				@"d:\projects\MyProject\MyProject.csproj",
+				@"d:\projects\MyProject\a.cs",
+				@"d:\projects\MYPROJECT\SRC\a.cs",
+				@"d:\projects\MyProject\src\b.cs");
+			DirectoryNode srcDirectoryNode = GetFirstDirectoryChildNode(projectNode);
+			srcDirectoryNode.Expanding();
+			
+			AddDependentFileToProject(@"d:\projects\MyProject\src\c.cs", "a.cs");
+			
+			FileNode fileNode = GetFirstFileChildNode(srcDirectoryNode);
+			FileNode childNode = GetFirstFileChildNode(fileNode);
+			Assert.AreEqual(@"d:\projects\MyProject\src\c.cs", childNode.FileName);
+		}
 	}
 }