diff -r 97bed1acd860 -r 2d53c653d8d2 PLCOpenEditor.py
--- a/PLCOpenEditor.py	Wed Feb 15 00:30:02 2012 +0100
+++ b/PLCOpenEditor.py	Thu Feb 16 22:55:50 2012 +0100
@@ -1221,9 +1221,9 @@
             window = self.TabsOpened.GetPage(selected)
             if not window.IsDebugging():
                 wx.CallAfter(self.SelectTypesTreeItem, window.GetTagName())
+                window.RefreshView()
             else:
                 wx.CallAfter(self.SelectInstancesTreeItem, window.GetInstancePath())
-            window.RefreshView()
         wx.CallAfter(self._Refresh, FILEMENU, EDITMENU, DISPLAYMENU, TOOLBAR)
         event.Skip()
 
@@ -1845,6 +1845,7 @@
                         icon = self.GenerateBitmap("ACTION", bodytype)
                     new_window.SetIcon(icon)
                     self.AddPage(new_window, "")
+                    new_window.RefreshView()
                     new_window.SetFocus()
                     self.RefreshPageTitles()
             if selected_item is not None and selected_infos[0] in ITEMS_VARIABLE:
@@ -1902,29 +1903,30 @@
             event.Skip()
         return AddVariableGraphic
 
-    def RecursiveInstancesTreeItemSelection(self, root, instancepath):
-        found = False
+    def GetInstancesTreeItem(self, root, instancepath):
         paths = instancepath.split(".", 1)
         if wx.VERSION >= (2, 6, 0):
             item, root_cookie = self.InstancesTree.GetFirstChild(root)
         else:
             item, root_cookie = self.InstancesTree.GetFirstChild(root, 0)
-        while item.IsOk() and not found:
+        while item.IsOk():
             name = self.InstancesTree.GetItemText(item).split(" (")[0]
             if name == paths[0]:
                 if len(paths) == 1:
-                    self.InstancesTree.SelectItem(item)
-                    return True
+                    return item
                 else:
-                    found = self.RecursiveInstancesTreeItemSelection(item, paths[1])
+                    return self.GetInstancesTreeItem(item, paths[1])
             item, root_cookie = self.InstancesTree.GetNextChild(root, root_cookie)
-        return found
+        return None
     
     def SelectInstancesTreeItem(self, instancepath):
         if self.InstancesTree is not None:
             root = self.InstancesTree.GetRootItem()
             if root.IsOk():
-                return self.RecursiveInstancesTreeItemSelection(root, instancepath)
+                item = self.GetInstancesTreeItem(root, instancepath)
+                if item is not None:
+                    self.InstancesTree.SelectItem(item)
+                    return True
         return False
     
     def ResetGraphicViewers(self):
@@ -1933,15 +1935,28 @@
             if isinstance(editor, GraphicViewer):
                 editor.ResetView()
 
-    def CloseDebugTabs(self):
+    def CloseObsoleteDebugTabs(self):
         if self.EnableDebug:
             idxs = range(self.TabsOpened.GetPageCount())
             idxs.reverse()
+            root = None
+            if self.InstancesTree is not None:
+                root = self.InstancesTree.GetRootItem()
+                if not root.IsOk():
+                    root = None
             for idx in idxs:
-                window = self.TabsOpened.GetPage(idx)
-                if window.IsDebugging():
-                    self.TabsOpened.DeletePage(idx)
-            self.DebugVariablePanel.ResetGrid()
+                editor = self.TabsOpened.GetPage(idx)
+                item = None
+                if root is not None:
+                    item = self.GetInstancesTreeItem(root, editor.GetInstancePath())
+                if editor.IsDebugging():
+                    if item is None:
+                        self.TabsOpened.DeletePage(idx)
+                    elif isinstance(editor, GraphicViewer):
+                        editor.ResetView()
+                    else:
+                        editor.RefreshView()
+            self.DebugVariablePanel.UnregisterObsoleteData()
     
     def AddDebugVariable(self, iec_path):
         if self.EnableDebug:
@@ -4109,6 +4124,16 @@
         self.VariablesGrid.RefreshButtons()
         self.Thaw()
     
+    def UnregisterObsoleteData(self):
+        for idx, item in enumerate(self.Table.GetData()):
+            if self.GetDataType(item.GetVariable()) is None:
+                self.RemoveDataConsumer(item)
+                self.Table.RemoveItem(idx)
+        self.Freeze()
+        self.Table.ResetView(self.VariablesGrid)
+        self.VariablesGrid.RefreshButtons()
+        self.Thaw()
+    
     def ResetGrid(self):
         self.DeleteDataConsumers()
         self.Table.Empty()