Disable target framework combobox in project options so that all target framework changes run through the UpgradeProject code path.

src/AddIns/BackendBindings/Boo/BooBinding/Project/Resources/BuildOptions.xfrm

@@ -181,9 +181,9 @@
         <TabIndex value="1" />
         <Controls>
           <System.Windows.Forms.Button>
-            <Name value="convertProjectToMSBuild35Button" />
+            <Name value="projectUpdateButton" />
             <Location value="337, 93" />
-            <Text value="Convert project to MSBuild 3.5.." />
+            <Text value="Change" />
             <UseVisualStyleBackColor value="True" />
             <Size value="166, 23" />
             <TabIndex value="12" />

src/AddIns/BackendBindings/CSharpBinding/Project/Resources/BuildOptions.xfrm

@@ -78,9 +78,9 @@
         <TabIndex value="1" />
         <Controls>
           <System.Windows.Forms.Button>
-            <Name value="convertProjectToMSBuild35Button" />
+            <Name value="projectUpdateButton" />
             <Location value="337, 106" />
-            <Text value="Convert project to C# 3.0..." />
+            <Text value="Change" />
             <UseVisualStyleBackColor value="True" />
             <Size value="173, 23" />
             <TabIndex value="12" />

src/AddIns/BackendBindings/VBNetBinding/Project/Resources/BuildOptions.xfrm

@@ -94,9 +94,9 @@
         <TabIndex value="1" />
         <Controls>
           <System.Windows.Forms.Button>
-            <Name value="convertProjectToMSBuild35Button" />
+            <Name value="projectUpdateButton" />
             <Location value="291, 113" />
-            <Text value="Convert project to VB 9..." />
+            <Text value="Change" />
             <UseVisualStyleBackColor value="True" />
             <Size value="179, 23" />
             <TabIndex value="10" />

src/Main/Base/Project/Src/Gui/Dialogs/OptionPanels/ProjectOptions/AbstractBuildOptions.cs

@@ -6,10 +6,10 @@ using System.Collections.Generic;
 using System.IO;
 using System.Linq;
 using System.Windows.Forms;
-
 using ICSharpCode.Core;
 using ICSharpCode.SharpDevelop.Project;
-using StringPair = System.Collections.Generic.KeyValuePair<System.String, System.String>;
+using ICSharpCode.SharpDevelop.Project.Converter;
+using StringPair = System.Collections.Generic.KeyValuePair<string, string>;
 
 namespace ICSharpCode.SharpDevelop.Gui.OptionPanels
 {
@@ -234,36 +234,18 @@ namespace ICSharpCode.SharpDevelop.Gui.OptionPanels
 		
 		protected void InitTargetFramework()
 		{
-			Button convertProjectToMSBuild35Button = (Button)ControlDictionary["convertProjectToMSBuild35Button"];
-			ComboBox targetFrameworkComboBox = (ComboBox)ControlDictionary["targetFrameworkComboBox"];
-			
-			if (convertProjectToMSBuild35Button != null) {
-				if (project.MinimumSolutionVersion <= Solution.SolutionVersionVS2008) {
-					// VS05/VS08 project
-					targetFrameworkComboBox.Enabled = false;
-					convertProjectToMSBuild35Button.Enabled = false;
-					return;
-				} else {
-					// VS2010 project
-					targetFrameworkComboBox.Enabled = true;
-					convertProjectToMSBuild35Button.Visible = false;
-				}
+			Button projectUpdateButton = ControlDictionary["projectUpdateButton"] as Button;
+			if (projectUpdateButton != null) {
+				projectUpdateButton.Click += delegate {
+					UpgradeViewContent.Show(project.ParentSolution).Select(project as IUpgradableProject);
+				};
+			}
+			ComboBox targetFrameworkComboBox = ControlDictionary["targetFrameworkComboBox"] as ComboBox;
+			if (targetFrameworkComboBox != null) {
+				targetFrameworkComboBox.Enabled = false;
+				targetFrameworkComboBox.Items.Add(((IUpgradableProject)project).CurrentTargetFramework.DisplayName);
+				targetFrameworkComboBox.SelectedIndex = 0;
 			}
-			
-			const string TargetFrameworkProperty = "TargetFrameworkVersion";
-			ConfigurationGuiBinding targetFrameworkBinding;
-			
-			targetFrameworkBinding = helper.BindStringEnum(
-				"targetFrameworkComboBox", TargetFrameworkProperty,
-				"v2.0",
-				(from targetFramework in TargetFramework.TargetFrameworks
-				 where targetFramework.DisplayName != null
-				 select new StringPair(targetFramework.Name, targetFramework.DisplayName)).ToArray());
-			targetFrameworkBinding.CreateLocationButton("targetFrameworkLabel");
-			helper.Saved += delegate {
-				CompilableProject cProject = (CompilableProject)project;
-				cProject.AddOrRemoveExtensions();
-			};
 		}
 	}
 }

src/Main/Base/Project/Src/Project/Converter/UpgradeView.xaml.cs

@@ -21,19 +21,35 @@ namespace ICSharpCode.SharpDevelop.Project.Converter
 	/// </summary>
 	internal partial class UpgradeView : UserControl
 	{
-		Solution solution;
+		readonly Solution solution;
+		readonly List<Entry> entries;
 		
 		public UpgradeView(Solution solution)
 		{
+			if (solution == null)
+				throw new ArgumentNullException("solution");
 			this.solution = solution;
 			InitializeComponent();
 			
-			listView.ItemsSource = solution.Projects.OfType<IUpgradableProject>().Select(p => new Entry(p)).ToList();
+			this.entries = solution.Projects.OfType<IUpgradableProject>().Select(p => new Entry(p)).ToList();
+			listView.ItemsSource = entries;
 			SortableGridViewColumn.SetCurrentSortColumn(listView, nameColumn);
 			SortableGridViewColumn.SetSortDirection(listView, ColumnSortDirection.Ascending);
 			ListView_SelectionChanged(null, null);
 		}
 		
+		public Solution Solution {
+			get { return solution; }
+		}
+		
+		public void Select(IUpgradableProject project)
+		{
+			foreach (Entry entry in entries) {
+				if (entry.Project == project)
+					listView.SelectedItem = entry;
+			}
+		}
+		
 		void SelectAllCheckBox_Checked(object sender, RoutedEventArgs e)
 		{
 			listView.SelectAll();

src/Main/Base/Project/Src/Project/Converter/UpgradeViewContent.cs

@@ -18,18 +18,42 @@ namespace ICSharpCode.SharpDevelop.Project.Converter
 			var projects = solution.Projects.OfType<IUpgradableProject>().ToList();
 			if (projects.Count > 0 && projects.All(u => u.UpgradeDesired)) {
 				Core.AnalyticsMonitorService.TrackFeature(typeof(UpgradeView), "opened automatically");
-				WorkbenchSingleton.Workbench.ShowView(new UpgradeViewContent(solution));
+				Show(solution);
 			}
 		}
 		
+		public static UpgradeViewContent Show(Solution solution)
+		{
+			foreach (UpgradeViewContent vc in WorkbenchSingleton.Workbench.ViewContentCollection.OfType<UpgradeViewContent>()) {
+				if (vc.Solution == solution) {
+					vc.WorkbenchWindow.SelectWindow();
+					return vc;
+				}
+			}
+			var newVC = new UpgradeViewContent(solution);
+			WorkbenchSingleton.Workbench.ShowView(newVC);
+			return newVC;
+		}
+		
 		UpgradeView upgradeView;
 		
 		public UpgradeViewContent(Solution solution)
 		{
+			if (solution == null)
+				throw new ArgumentNullException("solution");
 			this.TitleName = "Project Upgrade";
 			upgradeView = new UpgradeView(solution);
 		}
 		
+		public Solution Solution {
+			get { return upgradeView.Solution; }
+		}
+		
+		public void Select(IUpgradableProject project)
+		{
+			upgradeView.Select(project);
+		}
+		
 		public override object Control {
 			get {
 				return upgradeView;
@@ -41,11 +65,7 @@ namespace ICSharpCode.SharpDevelop.Project.Converter
 	{
 		public override void Run()
 		{
-			UpgradeViewContent uvc = WorkbenchSingleton.Workbench.ViewContentCollection.OfType<UpgradeViewContent>().FirstOrDefault();
-			if (uvc != null)
-				uvc.WorkbenchWindow.SelectWindow();
-			else if (ProjectService.OpenSolution != null)
-				WorkbenchSingleton.Workbench.ShowView(new UpgradeViewContent(ProjectService.OpenSolution));
+			UpgradeViewContent.Show(ProjectService.OpenSolution);
 		}
 	}
 }