diff -r 599e43ec921b -r 2ef048b5383c controls/DebugVariablePanel/DebugVariableGraphicPanel.py
--- a/controls/DebugVariablePanel/DebugVariableGraphicPanel.py	Mon Jun 03 11:52:13 2013 +0200
+++ b/controls/DebugVariablePanel/DebugVariableGraphicPanel.py	Mon Jun 03 17:29:03 2013 +0200
@@ -215,6 +215,9 @@
         
         self.SetSizer(main_sizer)
     
+    def __del__(self):
+        DebugViewer.__del__(self)
+    
     def SetTickTime(self, ticktime=0):
         self.Ticktime = ticktime
         if self.Ticktime == 0:
@@ -377,7 +380,7 @@
                 if isinstance(panel, DebugVariableTextViewer) or panel.Is3DCanvas():
                     if y_mouse > yw + height / 2:
                         idx += 1
-                    wx.CallAfter(self.MoveValue, variable, idx)
+                    wx.CallAfter(self.MoveValue, variable, idx, True)
                 else:
                     rect = panel.GetAxesBoundingBox(True)
                     if rect.InsideXY(x_mouse, y_mouse):
@@ -388,13 +391,13 @@
                     else:
                         if y_mouse > yw + height / 2:
                             idx += 1
-                        wx.CallAfter(self.MoveValue, variable, idx)
+                        wx.CallAfter(self.MoveValue, variable, idx, True)
                 self.ForceRefresh()
                 return 
         width, height = self.GraphicsWindow.GetVirtualSize()
         rect = wx.Rect(0, 0, width, height)
         if rect.InsideXY(x_mouse, y_mouse):
-            wx.CallAfter(self.MoveValue, variable, len(self.GraphicPanels))
+            wx.CallAfter(self.MoveValue, variable, len(self.GraphicPanels), True)
         self.ForceRefresh()
     
     def RefreshView(self):
@@ -591,9 +594,6 @@
     def IsViewerFirst(self, viewer):
         return viewer == self.GraphicPanels[0]
     
-    def IsViewerLast(self, viewer):
-        return viewer == self.GraphicPanels[-1]
-    
     def HighlightPreviousViewer(self, viewer):
         if self.IsViewerFirst(viewer):
             return
@@ -619,7 +619,7 @@
     def GetVariableNameMask(self):
         return self.VariableNameMask
     
-    def InsertValue(self, iec_path, idx = None, force=False):
+    def InsertValue(self, iec_path, idx = None, force=False, graph=False):
         for panel in self.GraphicPanels:
             if panel.GetItem(iec_path) is not None:
                 return
@@ -630,7 +630,7 @@
         if result is not None or force:
             
             self.Freeze()
-            if item.IsNumVariable():
+            if item.IsNumVariable() and graph:
                 panel = DebugVariableGraphicViewer(self.GraphicsWindow, self, [item], GRAPH_PARALLEL)
                 if self.CursorTick is not None:
                     panel.SetCursorTick(self.CursorTick)
@@ -645,7 +645,7 @@
             self.Thaw()
             self.ForceRefresh()
     
-    def MoveValue(self, iec_path, idx = None):
+    def MoveValue(self, iec_path, idx = None, graph=False):
         if idx is None:
             idx = len(self.GraphicPanels)
         source_panel = None
@@ -656,22 +656,29 @@
                 source_panel = panel
                 break
         if source_panel is not None:
+            source_panel_idx = self.GraphicPanels.index(source_panel)
+            if len(panel.GetItems()) == 1 and \
+               idx in [source_panel_idx, source_panel_idx + 1]:
+                return
+            
             source_panel.RemoveItem(item)
             source_size = source_panel.GetSize()
+            if item.IsNumVariable() and graph:
+                panel = DebugVariableGraphicViewer(self.GraphicsWindow, self, [item], GRAPH_PARALLEL)
+                panel.SetCanvasSize(source_size.width, source_size.height)
+                if self.CursorTick is not None:
+                    panel.SetCursorTick(self.CursorTick)
+            else:
+                panel = DebugVariableTextViewer(self.GraphicsWindow, self, [item])
+            
+            self.GraphicPanels.insert(idx, panel)
+            
             if source_panel.ItemsIsEmpty():
                 if source_panel.HasCapture():
                     source_panel.ReleaseMouse()
                 self.GraphicPanels.remove(source_panel)
                 source_panel.Destroy()
             
-            if item.IsNumVariable():
-                panel = DebugVariableGraphicViewer(self.GraphicsWindow, self, [item], GRAPH_PARALLEL)
-                panel.SetCanvasSize(source_size.width, source_size.height)
-                if self.CursorTick is not None:
-                    panel.SetCursorTick(self.CursorTick)
-            else:
-                panel = DebugVariableTextViewer(self.GraphicsWindow, self, [item])
-            self.GraphicPanels.insert(idx, panel)
             self.ResetVariableNameMask()
             self.RefreshGraphicsSizer()
             self.ForceRefresh()
@@ -751,6 +758,22 @@
                     self.RefreshGraphicsSizer()
             self.ForceRefresh()
     
+    def ToggleViewerType(self, panel):
+        panel_idx = self.GetViewerIndex(panel)
+        if panel_idx is not None:
+            self.GraphicPanels.remove(panel)
+            items = panel.GetItems()
+            if isinstance(panel, DebugVariableGraphicViewer):
+                for idx, item in enumerate(items):
+                    new_panel = DebugVariableTextViewer(self.GraphicsWindow, self, [item])
+                    self.GraphicPanels.insert(panel_idx + idx, new_panel)
+            else:
+                new_panel = DebugVariableGraphicViewer(self.GraphicsWindow, self, items, GRAPH_PARALLEL)
+                self.GraphicPanels.insert(panel_idx, new_panel)
+            panel.Destroy()
+        self.RefreshGraphicsSizer()
+        self.ForceRefresh()
+    
     def ResetGraphicsValues(self):
         self.Ticks = numpy.array([])
         self.StartTick = 0