diff --git a/ganttproject/src/net/sourceforge/ganttproject/GPTreeTableBase.java b/ganttproject/src/net/sourceforge/ganttproject/GPTreeTableBase.java
index b331be04be..a6e8b56e4a 100644
--- a/ganttproject/src/net/sourceforge/ganttproject/GPTreeTableBase.java
+++ b/ganttproject/src/net/sourceforge/ganttproject/GPTreeTableBase.java
@@ -58,6 +58,7 @@ of the License, or (at your option) any later version.
 import javax.swing.event.TableColumnModelListener;
 import javax.swing.event.TreeExpansionEvent;
 import javax.swing.event.TreeExpansionListener;
+import javax.swing.table.DefaultTableCellRenderer;
 import javax.swing.table.JTableHeader;
 import javax.swing.table.TableCellEditor;
 import javax.swing.table.TableCellRenderer;
@@ -70,15 +71,10 @@ of the License, or (at your option) any later version.
 import java.awt.event.KeyEvent;
 import java.awt.event.MouseAdapter;
 import java.awt.event.MouseEvent;
-import java.util.ArrayList;
-import java.util.Collection;
-import java.util.Collections;
-import java.util.Comparator;
-import java.util.EventObject;
-import java.util.GregorianCalendar;
-import java.util.LinkedList;
+import java.text.DecimalFormat;
+import java.text.NumberFormat;
+import java.util.*;
 import java.util.List;
-import java.util.ListIterator;
 import java.util.concurrent.Executors;
 import java.util.concurrent.ScheduledExecutorService;
 import java.util.concurrent.TimeUnit;
@@ -96,6 +92,16 @@ public void applyComponentOrientation(ComponentOrientation o) {
     }
   };
 
+  class DecimalRenderer extends DefaultTableCellRenderer {
+    // private final DecimalFormat myFormatter = new DecimalFormat("#0.00");
+    private final DecimalFormat myFormatter = new DecimalFormat(NumberFormat.getNumberInstance(GanttLanguage.getInstance().getLocale()).toString());
+
+    public Component getTableCellRendererComponent (JTable table, Object value, boolean isSelected, boolean hasFocus, int row, int column) {
+      value = myFormatter.format((Number)value);
+      return super.getTableCellRendererComponent(table, value, isSelected, hasFocus, row, column);
+    }
+  }
+
   private GPAction myEditCellAction = new GPAction("tree.edit") {
     @Override
     public void actionPerformed(ActionEvent e) {
@@ -911,12 +917,20 @@ protected List<ColumnList.Column> getDefaultColumns() {
   protected TableColumnExt newTableColumnExt(int modelIndex) {
     TableColumnExt result = new TableColumnExt(modelIndex);
     Class<?> columnClass = getTreeTableModel().getColumnClass(modelIndex);
-    TableCellRenderer renderer = createCellRenderer(columnClass);
+    String columnName = getTreeTableModel().getColumnName(modelIndex).toLowerCase();
+    TableCellRenderer renderer;
+    Boolean costColumn = false;
+    if (Double.class.equals(columnClass) && columnName.equals("cost")) {
+      renderer = new DecimalRenderer();
+      costColumn = true;
+    } else {
+      renderer = createCellRenderer(columnClass);
+    }
     if (renderer != null) {
       result.setCellRenderer(renderer);
     }
     TableCellEditor editor = createCellEditor(columnClass);
-    if (editor != null) {
+    if (editor != null && !costColumn) {
       result.setCellEditor(editor);
     } else {
       System.err.println("no editor for column=" + modelIndex + " class=" + columnClass);
@@ -931,7 +945,7 @@ private TableCellRenderer createCellRenderer(Class<?> columnClass) {
     // {
     // renderer = TableCellRenderers.getNewDefaultRenderer(columnClass);
     //
-    // }
+    //}
     return getTreeTable().getDefaultRenderer(columnClass);
   }