Expressions with dot resolved properly in debugger tooltip

git-svn-id: svn://svn.sharpdevelop.net/sharpdevelop/trunk@906 1ccf3a8d-04fe-1044-b7c0-cef0b8235c61

src/AddIns/Misc/Debugger/Debugger.Core/Project/Src/Variables/Value.cs

@@ -93,7 +93,7 @@ namespace Debugger
 		
 		public Variable this[string variableName] {
 			get {
-				foreach(Variable v in GetSubVariables(delegate{return this;})) {
+				foreach(Variable v in GetSubVariables(delegate{ return this.IsExpired?new UnavailableValue(debugger, "Value has expired"):this;})) {
 					if (v.Name == variableName) return v;
 				}
 				throw new DebuggerException("Subvariable " + variableName + " does not exist");

src/AddIns/Misc/Debugger/Debugger.Core/Project/Src/Variables/VariableCollection.cs

@@ -120,7 +120,7 @@ namespace Debugger
 				if (index != -1) {
 					string rootVariable = variableName.Substring(0, index);
 					string subVariable = variableName.Substring(index + 1);
-					return this[rootVariable].Value[subVariable];
+					return this[rootVariable].SubVariables[subVariable];
 				} else {
 					foreach (Variable v in InnerList) {
 						if (v.Name == variableName) {