Revert "Generalize the work with the tree-nodes context menu."

This reverts commit b2c532bfe9.

ILSpy/TreeNodes/AssemblyTreeNode.cs

@@ -46,6 +46,9 @@ namespace ICSharpCode.ILSpy.TreeNodes
 		readonly List<TypeTreeNode> classes = new List<TypeTreeNode>();
 		readonly Dictionary<string, NamespaceTreeNode> namespaces = new Dictionary<string, NamespaceTreeNode>();
 		
+		// UI
+		ContextMenu menu;
+		
 		public AssemblyTreeNode(string fileName, AssemblyList assemblyList)
 		{
 			if (fileName == null)
@@ -60,7 +63,7 @@ namespace ICSharpCode.ILSpy.TreeNodes
 			
 			this.LazyLoading = true;
 			
-			CreateContextMenu();
+			CreateRemoveItemContextMenu();
 		}
 		
 		public string FileName {
@@ -126,12 +129,10 @@ namespace ICSharpCode.ILSpy.TreeNodes
 			}
 		}
 		
-		protected override void CreateContextMenu()
+		void CreateRemoveItemContextMenu()
 		{
-			// this is necesary since it create the instance of the context menu
-			base.CreateContextMenu();
-		
-			// add specific items - remove assembly
+			var menu = GetContextMenu();
+			
 			MenuItem item = new MenuItem() {
 				Header = "Remove assembly",
 				Icon = new Image() { Source = Images.Delete }
@@ -139,7 +140,7 @@ namespace ICSharpCode.ILSpy.TreeNodes
 			
 			item.Click += delegate { Delete(); };
 			
-			contextMenu.Items.Add(item);
+			menu.Items.Add(item);
 		}
 		
 		sealed class MyAssemblyResolver : IAssemblyResolver
@@ -176,6 +177,14 @@ namespace ICSharpCode.ILSpy.TreeNodes
 			}
 		}
 		
+		public override ContextMenu GetContextMenu()
+		{
+			if (menu != null)
+				return menu;
+			
+			return (menu = new ContextMenu());
+		}
+		
 		protected override void LoadChildren()
 		{
 			try {

ILSpy/TreeNodes/ILSpyTreeNode.cs

@@ -20,8 +20,6 @@ using System;
 using System.Collections.ObjectModel;
 using System.Collections.Specialized;
 using System.ComponentModel;
-using System.Windows;
-using System.Windows.Controls;
 
 using ICSharpCode.Decompiler;
 using ICSharpCode.TreeView;
@@ -33,9 +31,6 @@ namespace ICSharpCode.ILSpy.TreeNodes
 	/// </summary>
 	abstract class ILSpyTreeNodeBase : SharpTreeNode
 	{
-		// UI
-		protected ContextMenu contextMenu;
-		
 		FilterSettings filterSettings;
 		
 		public FilterSettings FilterSettings {
@@ -66,18 +61,6 @@ namespace ICSharpCode.ILSpy.TreeNodes
 				return FilterResult.Hidden;
 		}
 		
-		protected virtual void CreateContextMenu()
-		{
-			contextMenu = new ContextMenu();
-			
-			// add common context menu items, e.g. copy.
-		}
-		
-		public override ContextMenu GetContextMenu()
-		{
-			return contextMenu;
-		}
-		
 		protected object HighlightSearchMatch(string text, string suffix = null)
 		{
 			// TODO: implement highlighting the search match