Fix #332: Unit Tests Panel: "All Tests" disappeared

src/AddIns/Analysis/UnitTesting/Pad/TestTreeView.cs

@@ -18,6 +18,7 @@
 
 using System;
 using System.Collections.Generic;
+using System.Collections.Specialized;
 using System.Linq;
 using ICSharpCode.Core;
 using ICSharpCode.NRefactory.TypeSystem;
@@ -52,15 +53,19 @@ namespace ICSharpCode.UnitTesting
 				testSolution = value;
 				if (testSolution != null) {
 					this.Root = new UnitTestNode(testSolution);
-					this.Root.Children.CollectionChanged += delegate {
-						this.ShowRoot = this.Root != null && this.Root.Children.Count > 1;
-					};
+					this.Root.Children.CollectionChanged += OnRootChildrenCollectionChanged;
+					OnRootChildrenCollectionChanged(null, null);
 				} else {
 					this.Root = null;
 				}
 			}
 		}
 		
+		void OnRootChildrenCollectionChanged(object sender, NotifyCollectionChangedEventArgs e)
+		{
+			this.ShowRoot = this.Root != null && this.Root.Children.Count > 1;
+		}
+		
 		public TestTreeView()
 		{
 			this.ShowRoot = false;