Index: /trunk/sources/HeuristicLab.Encodings.SymbolicExpressionTreeEncoding.Views/3.4/SymbolicExpressionView.cs
===================================================================
--- /trunk/sources/HeuristicLab.Encodings.SymbolicExpressionTreeEncoding.Views/3.4/SymbolicExpressionView.cs	(revision 9820)
+++ /trunk/sources/HeuristicLab.Encodings.SymbolicExpressionTreeEncoding.Views/3.4/SymbolicExpressionView.cs	(revision 9821)
@@ -31,6 +31,5 @@
   [Content(typeof(ISymbolicExpressionTree), false)]
   public partial class SymbolicExpressionView : AsynchronousContentView {
-
-    List<ISymbolicExpressionTreeStringFormatter> treeFormattersList = new List<ISymbolicExpressionTreeStringFormatter>();
+    private readonly List<ISymbolicExpressionTreeStringFormatter> treeFormattersList = new List<ISymbolicExpressionTreeStringFormatter>();
 
     public new ISymbolicExpressionTree Content {
@@ -48,5 +47,5 @@
       }
       if (formattersComboBox.Items.Count > 0)
-        formattersComboBox.SelectedIndex = 0;
+        formattersComboBox.SelectedIndex = treeFormattersList.FindIndex(0, treeFormattersList.Count, (f) => f.Name.Contains("Default"));
       else
         formattersComboBox.SelectedIndex = -1;
Index: /trunk/sources/HeuristicLab.Encodings.SymbolicExpressionTreeEncoding/3.4/Formatters/SymbolicExpressionTreeGraphvizFormatter.cs
===================================================================
--- /trunk/sources/HeuristicLab.Encodings.SymbolicExpressionTreeEncoding/3.4/Formatters/SymbolicExpressionTreeGraphvizFormatter.cs	(revision 9820)
+++ /trunk/sources/HeuristicLab.Encodings.SymbolicExpressionTreeEncoding/3.4/Formatters/SymbolicExpressionTreeGraphvizFormatter.cs	(revision 9821)
@@ -20,12 +20,10 @@
 #endregion
 
+using System.Collections.Generic;
 using System.Text;
-using HeuristicLab.Persistence.Default.CompositeSerializers.Storable;
-using HeuristicLab.Encodings.SymbolicExpressionTreeEncoding;
-using System.Collections.Generic;
+using HeuristicLab.Common;
 using HeuristicLab.Core;
-using HeuristicLab.Common;
 
-namespace HeuristicLab.Encodings.SymbolicExpressionTreeEncoding.Formatters {
+namespace HeuristicLab.Encodings.SymbolicExpressionTreeEncoding {
   [Item("GraphViz String Formatter", "Formatter for symbolic expression trees for visualization with GraphViz.")]
   public sealed class SymbolicExpressionTreeGraphvizFormatter : NamedItem, ISymbolicExpressionTreeStringFormatter {
Index: /trunk/sources/HeuristicLab.Problems.DataAnalysis.Symbolic/3.4/Formatters/SymbolicDataAnalysisExpressionSmalltalkFormatter.cs
===================================================================
--- /trunk/sources/HeuristicLab.Problems.DataAnalysis.Symbolic/3.4/Formatters/SymbolicDataAnalysisExpressionSmalltalkFormatter.cs	(revision 9821)
+++ /trunk/sources/HeuristicLab.Problems.DataAnalysis.Symbolic/3.4/Formatters/SymbolicDataAnalysisExpressionSmalltalkFormatter.cs	(revision 9821)
@@ -0,0 +1,185 @@
+﻿#region License Information
+/* HeuristicLab
+ * Copyright (C) 2002-2013 Heuristic and Evolutionary Algorithms Laboratory (HEAL)
+ *
+ * This file is part of HeuristicLab.
+ *
+ * HeuristicLab is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * HeuristicLab is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with HeuristicLab. If not, see <http://www.gnu.org/licenses/>.
+ */
+#endregion
+
+using System.Globalization;
+using System.Text;
+using HeuristicLab.Common;
+using HeuristicLab.Core;
+using HeuristicLab.Encodings.SymbolicExpressionTreeEncoding;
+
+namespace HeuristicLab.Problems.DataAnalysis.Symbolic {
+
+  [Item("Smalltalk String Formatter", "String formatter for string representations of symbolic expression trees in Smalltalk syntax.")]
+  public class SymbolicDataAnalysisExpressionSmalltalkFormatter : NamedItem, ISymbolicExpressionTreeStringFormatter {
+
+    protected SymbolicDataAnalysisExpressionSmalltalkFormatter(SymbolicDataAnalysisExpressionSmalltalkFormatter original, Cloner cloner) : base(original, cloner) { }
+    public SymbolicDataAnalysisExpressionSmalltalkFormatter()
+      : base() {
+      Name = ItemName;
+      Description = ItemDescription;
+    }
+
+    public string Format(ISymbolicExpressionTree symbolicExpressionTree) {
+      return FormatRecursively(symbolicExpressionTree.Root);
+    }
+
+    // returns the smalltalk expression corresponding to the node 
+    // smalltalk expressions are always surrounded by parantheses "(<expr>)"
+    private string FormatRecursively(ISymbolicExpressionTreeNode node) {
+
+      ISymbol symbol = node.Symbol;
+
+      if (symbol is ProgramRootSymbol || symbol is StartSymbol)
+        return FormatRecursively(node.GetSubtree(0));
+
+      StringBuilder stringBuilder = new StringBuilder(20);
+
+      stringBuilder.Append("(");
+
+      if (symbol is Addition) {
+        for (int i = 0; i < node.SubtreeCount; i++) {
+          if (i > 0) stringBuilder.Append("+");
+          stringBuilder.Append(FormatRecursively(node.GetSubtree(i)));
+        }
+      } else if (symbol is And) {
+        stringBuilder.Append("(");
+        for (int i = 0; i < node.SubtreeCount; i++) {
+          if (i > 0) stringBuilder.Append("&");
+          stringBuilder.Append("(");
+          stringBuilder.Append(FormatRecursively(node.GetSubtree(i)));
+          stringBuilder.Append(" > 0)");
+        }
+        stringBuilder.Append(") ifTrue:[1] ifFalse:[-1]");
+      } else if (symbol is Average) {
+        stringBuilder.Append("(1/");
+        stringBuilder.Append(node.SubtreeCount);
+        stringBuilder.Append(")*(");
+        for (int i = 0; i < node.SubtreeCount; i++) {
+          if (i > 0) stringBuilder.Append("+");
+          stringBuilder.Append(FormatRecursively(node.GetSubtree(i)));
+        }
+        stringBuilder.Append(")");
+      } else if (symbol is Constant) {
+        ConstantTreeNode constantTreeNode = node as ConstantTreeNode;
+        stringBuilder.Append(constantTreeNode.Value.ToString(CultureInfo.InvariantCulture));
+      } else if (symbol is Cosine) {
+        stringBuilder.Append(FormatRecursively(node.GetSubtree(0)));
+        stringBuilder.Append(" cos");
+      } else if (symbol is Division) {
+        if (node.SubtreeCount == 1) {
+          stringBuilder.Append("1/");
+          stringBuilder.Append(FormatRecursively(node.GetSubtree(0)));
+        } else {
+          stringBuilder.Append(FormatRecursively(node.GetSubtree(0)));
+          stringBuilder.Append("/(");
+          for (int i = 1; i < node.SubtreeCount; i++) {
+            if (i > 1) stringBuilder.Append("*");
+            stringBuilder.Append(FormatRecursively(node.GetSubtree(i)));
+          }
+          stringBuilder.Append(")");
+        }
+      } else if (symbol is Exponential) {
+        stringBuilder.Append(FormatRecursively(node.GetSubtree(0)));
+        stringBuilder.Append(" exp");
+      } else if (symbol is GreaterThan) {
+        stringBuilder.Append("(");
+        stringBuilder.Append(FormatRecursively(node.GetSubtree(0)));
+        stringBuilder.Append(" > ");
+        stringBuilder.Append(FormatRecursively(node.GetSubtree(1)));
+        stringBuilder.Append(") ifTrue: [1] ifFalse: [-1]");
+      } else if (symbol is IfThenElse) {
+        stringBuilder.Append("(");
+        stringBuilder.Append(FormatRecursively(node.GetSubtree(0)));
+        stringBuilder.Append(" > 0) ifTrue: [");
+        stringBuilder.Append(FormatRecursively(node.GetSubtree(1)));
+        stringBuilder.Append("] ifFalse: [");
+        stringBuilder.Append(FormatRecursively(node.GetSubtree(2)));
+        stringBuilder.Append("]");
+      } else if (symbol is LaggedVariable) {
+        stringBuilder.Append("lagged variable not implemented");
+      } else if (symbol is LessThan) {
+        stringBuilder.Append("(");
+        stringBuilder.Append(FormatRecursively(node.GetSubtree(0)));
+        stringBuilder.Append(" < ");
+        stringBuilder.Append(FormatRecursively(node.GetSubtree(1)));
+        stringBuilder.Append(") ifTrue: [1] ifFalse: [-1]");
+      } else if (symbol is Logarithm) {
+        stringBuilder.Append(FormatRecursively(node.GetSubtree(0)));
+        stringBuilder.Append("ln");
+      } else if (symbol is Multiplication) {
+        for (int i = 0; i < node.SubtreeCount; i++) {
+          if (i > 0) stringBuilder.Append("*");
+          stringBuilder.Append(FormatRecursively(node.GetSubtree(i)));
+        }
+      } else if (symbol is Not) {
+        stringBuilder.Append("(");
+        stringBuilder.Append(FormatRecursively(node.GetSubtree(0)));
+        stringBuilder.Append(">0) ifTrue: [-1] ifFalse: [1.0]");
+      } else if (symbol is Or) {
+        stringBuilder.Append("(");
+        for (int i = 0; i < node.SubtreeCount; i++) {
+          if (i > 0) stringBuilder.Append("|");
+          stringBuilder.Append("(");
+          stringBuilder.Append(FormatRecursively(node.GetSubtree(i)));
+          stringBuilder.Append(">0)");
+        }
+        stringBuilder.Append(") ifTrue:[1] ifFalse:[-1]");
+      } else if (symbol is Sine) {
+        stringBuilder.Append(FormatRecursively(node.GetSubtree(0)));
+        stringBuilder.Append(" sin");
+      } else if (symbol is Subtraction) {
+        if (node.SubtreeCount == 1) {
+          stringBuilder.Append("-1*");
+          stringBuilder.Append(FormatRecursively(node.GetSubtree(0)));
+        } else {
+          stringBuilder.Append(FormatRecursively(node.GetSubtree(0)));
+          for (int i = 1; i < node.SubtreeCount; i++) {
+            stringBuilder.Append(" - ");
+            stringBuilder.Append(FormatRecursively(node.GetSubtree(i)));
+          }
+        }
+      } else if (symbol is Tangent) {
+        stringBuilder.Append(FormatRecursively(node.GetSubtree(0)));
+        stringBuilder.Append(" tan");
+      } else if (symbol is Variable) {
+        VariableTreeNode variableTreeNode = node as VariableTreeNode;
+        stringBuilder.Append(variableTreeNode.Weight.ToString(CultureInfo.InvariantCulture));
+        stringBuilder.Append("*");
+        stringBuilder.Append(variableTreeNode.VariableName);
+      } else {
+        stringBuilder.Append("(");
+        for (int i = 0; i < node.SubtreeCount; i++) {
+          if (i > 0) stringBuilder.Append(", ");
+          stringBuilder.Append(FormatRecursively(node.GetSubtree(i)));
+        }
+        stringBuilder.AppendFormat(" {0} [Not Supported] )", node.Symbol.Name);
+      }
+
+      stringBuilder.Append(")");
+
+      return stringBuilder.ToString();
+    }
+
+    public override IDeepCloneable Clone(Cloner cloner) {
+      return new SymbolicDataAnalysisExpressionSmalltalkFormatter(this, cloner);
+    }
+  }
+}
Index: unk/sources/HeuristicLab.Problems.DataAnalysis.Symbolic/3.4/Formatters/SymbolicExpressionTreeSmalltalkStringFormatter.cs
===================================================================
--- /trunk/sources/HeuristicLab.Problems.DataAnalysis.Symbolic/3.4/Formatters/SymbolicExpressionTreeSmalltalkStringFormatter.cs	(revision 9820)
+++ 	(revision )
@@ -1,185 +1,0 @@
-﻿#region License Information
-/* HeuristicLab
- * Copyright (C) 2002-2013 Heuristic and Evolutionary Algorithms Laboratory (HEAL)
- *
- * This file is part of HeuristicLab.
- *
- * HeuristicLab is free software: you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation, either version 3 of the License, or
- * (at your option) any later version.
- *
- * HeuristicLab is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
- * GNU General Public License for more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with HeuristicLab. If not, see <http://www.gnu.org/licenses/>.
- */
-#endregion
-
-using System.Globalization;
-using System.Text;
-using HeuristicLab.Core;
-using HeuristicLab.Common;
-using HeuristicLab.Problems.DataAnalysis.Symbolic;
-using Variable = HeuristicLab.Problems.DataAnalysis.Symbolic.Variable;
-
-namespace HeuristicLab.Encodings.SymbolicExpressionTreeEncoding.Formatters {
-
-  [Item("Smalltalk String Formatter", "String formatter for string representations of symbolic expression trees in Smalltalk syntax.")]
-  public class SymbolicExpressionTreeSmalltalkStringFormatter : NamedItem, ISymbolicExpressionTreeStringFormatter {
-
-    protected SymbolicExpressionTreeSmalltalkStringFormatter(SymbolicExpressionTreeSmalltalkStringFormatter original, Cloner cloner) : base(original, cloner) { }
-    public SymbolicExpressionTreeSmalltalkStringFormatter()
-      : base() {
-      Name = "Smalltalk String Formatter";
-    }
-
-    public string Format(ISymbolicExpressionTree symbolicExpressionTree) {
-      return FormatRecursively(symbolicExpressionTree.Root);
-    }
-
-    // returns the smalltalk expression corresponding to the node 
-    // smalltalk expressions are always surrounded by parantheses "(<expr>)"
-    private string FormatRecursively(ISymbolicExpressionTreeNode node) {
-
-      ISymbol symbol = node.Symbol;
-
-      if (symbol is ProgramRootSymbol || symbol is StartSymbol)
-        return FormatRecursively(node.GetSubtree(0));
-
-      StringBuilder stringBuilder = new StringBuilder(20);
-
-      stringBuilder.Append("(");
-
-      if (symbol is Addition) {
-        for (int i = 0; i < node.SubtreeCount; i++) {
-          if (i > 0) stringBuilder.Append("+");
-          stringBuilder.Append(FormatRecursively(node.GetSubtree(i)));
-        }
-      } else if (symbol is And) {
-        stringBuilder.Append("(");
-        for (int i = 0; i < node.SubtreeCount; i++) {
-          if (i > 0) stringBuilder.Append("&");
-          stringBuilder.Append("(");
-          stringBuilder.Append(FormatRecursively(node.GetSubtree(i)));
-          stringBuilder.Append(" > 0)");
-        }
-        stringBuilder.Append(") ifTrue:[1] ifFalse:[-1]");
-      } else if (symbol is Average) {
-        stringBuilder.Append("(1/");
-        stringBuilder.Append(node.SubtreeCount);
-        stringBuilder.Append(")*(");
-        for (int i = 0; i < node.SubtreeCount; i++) {
-          if (i > 0) stringBuilder.Append("+");
-          stringBuilder.Append(FormatRecursively(node.GetSubtree(i)));
-        }
-        stringBuilder.Append(")");
-      } else if (symbol is Constant) {
-        ConstantTreeNode constantTreeNode = node as ConstantTreeNode;
-        stringBuilder.Append(constantTreeNode.Value.ToString(CultureInfo.InvariantCulture));
-      } else if (symbol is Cosine) {
-        stringBuilder.Append(FormatRecursively(node.GetSubtree(0)));
-        stringBuilder.Append(" cos");
-      } else if (symbol is Division) {
-        if (node.SubtreeCount == 1) {
-          stringBuilder.Append("1/");
-          stringBuilder.Append(FormatRecursively(node.GetSubtree(0)));
-        } else {
-          stringBuilder.Append(FormatRecursively(node.GetSubtree(0)));
-          stringBuilder.Append("/(");
-          for (int i = 1; i < node.SubtreeCount; i++) {
-            if (i > 1) stringBuilder.Append("*");
-            stringBuilder.Append(FormatRecursively(node.GetSubtree(i)));
-          }
-          stringBuilder.Append(")");
-        }
-      } else if (symbol is Exponential) {
-        stringBuilder.Append(FormatRecursively(node.GetSubtree(0)));
-        stringBuilder.Append(" exp");
-      } else if (symbol is GreaterThan) {
-        stringBuilder.Append("(");
-        stringBuilder.Append(FormatRecursively(node.GetSubtree(0)));
-        stringBuilder.Append(" > ");
-        stringBuilder.Append(FormatRecursively(node.GetSubtree(1)));
-        stringBuilder.Append(") ifTrue: [1] ifFalse: [-1]");
-      } else if (symbol is IfThenElse) {
-        stringBuilder.Append("(");
-        stringBuilder.Append(FormatRecursively(node.GetSubtree(0)));
-        stringBuilder.Append(" > 0) ifTrue: [");
-        stringBuilder.Append(FormatRecursively(node.GetSubtree(1)));
-        stringBuilder.Append("] ifFalse: [");
-        stringBuilder.Append(FormatRecursively(node.GetSubtree(2)));
-        stringBuilder.Append("]");
-      } else if (symbol is LaggedVariable) {
-        stringBuilder.Append("lagged variable not implemented");
-      } else if (symbol is LessThan) {
-        stringBuilder.Append("(");
-        stringBuilder.Append(FormatRecursively(node.GetSubtree(0)));
-        stringBuilder.Append(" < ");
-        stringBuilder.Append(FormatRecursively(node.GetSubtree(1)));
-        stringBuilder.Append(") ifTrue: [1] ifFalse: [-1]");
-      } else if (symbol is Logarithm) {
-        stringBuilder.Append(FormatRecursively(node.GetSubtree(0)));
-        stringBuilder.Append("ln");
-      } else if (symbol is Multiplication) {
-        for (int i = 0; i < node.SubtreeCount; i++) {
-          if (i > 0) stringBuilder.Append("*");
-          stringBuilder.Append(FormatRecursively(node.GetSubtree(i)));
-        }
-      } else if (symbol is Not) {
-        stringBuilder.Append("(");
-        stringBuilder.Append(FormatRecursively(node.GetSubtree(0)));
-        stringBuilder.Append(">0) ifTrue: [-1] ifFalse: [1.0]");
-      } else if (symbol is Or) {
-        stringBuilder.Append("(");
-        for (int i = 0; i < node.SubtreeCount; i++) {
-          if (i > 0) stringBuilder.Append("|");
-          stringBuilder.Append("(");
-          stringBuilder.Append(FormatRecursively(node.GetSubtree(i)));
-          stringBuilder.Append(">0)");
-        }
-        stringBuilder.Append(") ifTrue:[1] ifFalse:[-1]");
-      } else if (symbol is Sine) {
-        stringBuilder.Append(FormatRecursively(node.GetSubtree(0)));
-        stringBuilder.Append(" sin");
-      } else if (symbol is Subtraction) {
-        if (node.SubtreeCount == 1) {
-          stringBuilder.Append("-1*");
-          stringBuilder.Append(FormatRecursively(node.GetSubtree(0)));
-        } else {
-          stringBuilder.Append(FormatRecursively(node.GetSubtree(0)));
-          for (int i = 1; i < node.SubtreeCount; i++) {
-            stringBuilder.Append(" - ");
-            stringBuilder.Append(FormatRecursively(node.GetSubtree(i)));
-          }
-        }
-      } else if (symbol is Tangent) {
-        stringBuilder.Append(FormatRecursively(node.GetSubtree(0)));
-        stringBuilder.Append(" tan");
-      } else if (symbol is Variable) {
-        VariableTreeNode variableTreeNode = node as VariableTreeNode;
-        stringBuilder.Append(variableTreeNode.Weight.ToString(CultureInfo.InvariantCulture));
-        stringBuilder.Append("*");
-        stringBuilder.Append(variableTreeNode.VariableName);
-      } else {
-        stringBuilder.Append("(");
-        for (int i = 0; i < node.SubtreeCount; i++) {
-          if (i > 0) stringBuilder.Append(", ");
-          stringBuilder.Append(FormatRecursively(node.GetSubtree(i)));
-        }
-        stringBuilder.AppendFormat(" {0} [Not Supported] )", node.Symbol.Name);
-      }
-
-      stringBuilder.Append(")");
-
-      return stringBuilder.ToString();
-    }
-
-    public override IDeepCloneable Clone(Cloner cloner) {
-      return new SymbolicExpressionTreeSmalltalkStringFormatter(this, cloner);
-    }
-  }
-}
Index: /trunk/sources/HeuristicLab.Problems.DataAnalysis.Symbolic/3.4/HeuristicLab.Problems.DataAnalysis.Symbolic-3.4.csproj
===================================================================
--- /trunk/sources/HeuristicLab.Problems.DataAnalysis.Symbolic/3.4/HeuristicLab.Problems.DataAnalysis.Symbolic-3.4.csproj	(revision 9820)
+++ /trunk/sources/HeuristicLab.Problems.DataAnalysis.Symbolic/3.4/HeuristicLab.Problems.DataAnalysis.Symbolic-3.4.csproj	(revision 9821)
@@ -140,5 +140,5 @@
     <Compile Include="Crossovers\SymbolicDataAnalysisExpressionSemanticSimilarityCrossover.cs" />
     <Compile Include="Formatters\SymbolicDataAnalysisExpressionExcelFormatter.cs" />
-    <Compile Include="Formatters\SymbolicExpressionTreeSmalltalkStringFormatter.cs" />
+    <Compile Include="Formatters\SymbolicDataAnalysisExpressionSmalltalkFormatter.cs" />
     <Compile Include="Interfaces\ISymbolicDataAnalysisExpressionCrossover.cs" />
     <Compile Include="Interfaces\ISymbolicDataAnalysisImpactValuesCalculator.cs" />
