Index: src/Plugins/Wti/Wti.Forms/NodePresenters/WtiProjectNodePresenter.cs
===================================================================
diff -u -ra4ac4e49268888b50f6f9606a1b8dd8225e1b24f -rde830d165e579ad499b766e36eb280aac8820653
--- src/Plugins/Wti/Wti.Forms/NodePresenters/WtiProjectNodePresenter.cs	(.../WtiProjectNodePresenter.cs)	(revision a4ac4e49268888b50f6f9606a1b8dd8225e1b24f)
+++ src/Plugins/Wti/Wti.Forms/NodePresenters/WtiProjectNodePresenter.cs	(.../WtiProjectNodePresenter.cs)	(revision de830d165e579ad499b766e36eb280aac8820653)
@@ -3,6 +3,7 @@
 using System.ComponentModel;
 
 using DelftTools.Controls;
+using DelftTools.Shell.Core;
 using DelftTools.Utils.Collections;
 
 using Wti.Data;
@@ -102,6 +103,12 @@
 
         public bool RemoveNodeData(object parentNodeData, object nodeData)
         {
+            var parentProject = (Project)parentNodeData;
+            var wtiProject = (WtiProject)nodeData;
+
+            parentProject.Items.Remove(wtiProject);
+            parentProject.NotifyObservers();
+
             return true;
         }
     }
Index: src/Plugins/Wti/Wti.Forms/Wti.Forms.csproj
===================================================================
diff -u -ra4ac4e49268888b50f6f9606a1b8dd8225e1b24f -rde830d165e579ad499b766e36eb280aac8820653
--- src/Plugins/Wti/Wti.Forms/Wti.Forms.csproj	(.../Wti.Forms.csproj)	(revision a4ac4e49268888b50f6f9606a1b8dd8225e1b24f)
+++ src/Plugins/Wti/Wti.Forms/Wti.Forms.csproj	(.../Wti.Forms.csproj)	(revision de830d165e579ad499b766e36eb280aac8820653)
@@ -68,6 +68,10 @@
       <Project>{9a2d67e6-26ac-4d17-b11a-2b4372f2f572}</Project>
       <Name>DelftTools.Controls</Name>
     </ProjectReference>
+    <ProjectReference Include="..\..\..\Common\DelftTools.Shell.Core\DelftTools.Shell.Core.csproj">
+      <Project>{82b61d20-fd4b-49be-9252-5bf6e3ee4666}</Project>
+      <Name>DelftTools.Shell.Core</Name>
+    </ProjectReference>
     <ProjectReference Include="..\..\..\Common\DelftTools.Shell.Gui\DelftTools.Shell.Gui.csproj">
       <Project>{30e4c2ae-719e-4d70-9fa9-668a9767fbfa}</Project>
       <Name>DelftTools.Shell.Gui</Name>
Index: test/Plugins/Wti/Wti.Forms.Test/NodePresenters/WtiProjectNodePresenterTest.cs
===================================================================
diff -u -ra4ac4e49268888b50f6f9606a1b8dd8225e1b24f -rde830d165e579ad499b766e36eb280aac8820653
--- test/Plugins/Wti/Wti.Forms.Test/NodePresenters/WtiProjectNodePresenterTest.cs	(.../WtiProjectNodePresenterTest.cs)	(revision a4ac4e49268888b50f6f9606a1b8dd8225e1b24f)
+++ test/Plugins/Wti/Wti.Forms.Test/NodePresenters/WtiProjectNodePresenterTest.cs	(.../WtiProjectNodePresenterTest.cs)	(revision de830d165e579ad499b766e36eb280aac8820653)
@@ -1,6 +1,7 @@
 using System.ComponentModel;
 
 using DelftTools.Controls;
+using DelftTools.Shell.Core;
 using DelftTools.Utils.Collections;
 
 using NUnit.Framework;
@@ -311,22 +312,22 @@
         }
 
         [Test]
-        public void RemoveNodeData_Always_ReturnTrue()
+        public void RemoveNodeData_ProjectWithWtiProject_ReturnTrueAndRemoveWtiProject()
         {
             // setup
-            var mocks = new MockRepository();
-            var dataMock = mocks.StrictMock<object>();
-            var nodeMock = mocks.StrictMock<ITreeNode>();
-            mocks.ReplayAll();
+            var wtiProject = new WtiProject();
 
+            var project = new Project();
+            project.Items.Add(wtiProject);
+
             var nodePresenter = new WtiProjectNodePresenter();
 
             // call
-            bool removalSuccesful = nodePresenter.RemoveNodeData(dataMock, nodeMock);
+            bool removalSuccesful = nodePresenter.RemoveNodeData(project, wtiProject);
 
             // assert
             Assert.IsTrue(removalSuccesful);
-            mocks.VerifyAll(); // Expect no calls on arguments
+            CollectionAssert.DoesNotContain(project.Items, wtiProject);
         }
     }
 }
\ No newline at end of file
Index: test/Plugins/Wti/Wti.Forms.Test/Wti.Forms.Test.csproj
===================================================================
diff -u -ra4ac4e49268888b50f6f9606a1b8dd8225e1b24f -rde830d165e579ad499b766e36eb280aac8820653
--- test/Plugins/Wti/Wti.Forms.Test/Wti.Forms.Test.csproj	(.../Wti.Forms.Test.csproj)	(revision a4ac4e49268888b50f6f9606a1b8dd8225e1b24f)
+++ test/Plugins/Wti/Wti.Forms.Test/Wti.Forms.Test.csproj	(.../Wti.Forms.Test.csproj)	(revision de830d165e579ad499b766e36eb280aac8820653)
@@ -68,6 +68,10 @@
       <Project>{9a2d67e6-26ac-4d17-b11a-2b4372f2f572}</Project>
       <Name>DelftTools.Controls</Name>
     </ProjectReference>
+    <ProjectReference Include="..\..\..\..\src\Common\DelftTools.Shell.Core\DelftTools.Shell.Core.csproj">
+      <Project>{82b61d20-fd4b-49be-9252-5bf6e3ee4666}</Project>
+      <Name>DelftTools.Shell.Core</Name>
+    </ProjectReference>
     <ProjectReference Include="..\..\..\..\src\Common\DelftTools.Shell.Gui\DelftTools.Shell.Gui.csproj">
       <Project>{30e4c2ae-719e-4d70-9fa9-668a9767fbfa}</Project>
       <Name>DelftTools.Shell.Gui</Name>