+class ModuleDictWrapper:
+    """Emulates a module with a dynamically compiled __dict__"""
+    def __init__(self, dict):
+        self.dict = dict
+        
+    def __getattr__(self, name):
+        if name in self.dict:
+            return self.dict[name]
+        else:
+            raise AttributeError
+
+class DemoModules:
+    """
+    Dynamically manages the original/modified versions of a demo
+    module
+    """
+    def __init__(self, name):
+        self.modActive = -1
+        self.name = name
+        
+        #              (dict , source ,  filename , description   , error information )        
+        #              (  0  ,   1    ,     2     ,      3        ,          4        )        
+        self.modules = [[None,  ""    ,    ""     , "<original>"  ,        None],
+                        [None,  ""    ,    ""     , "<modified>"  ,        None]]
+        
+        # load original module
+        self.LoadFromFile(modOriginal, GetOriginalFilename(name))
+        self.SetActive(modOriginal)
+
+        # load modified module (if one exists)
+        if DoesModifiedExist(name):
+           self.LoadFromFile(modModified, GetModifiedFilename(name))
+
+
+    def LoadFromFile(self, modID, filename):
+        self.modules[modID][2] = filename
+        file = open(filename, "rt")
+        self.LoadFromSource(modID, file.read())
+        file.close()
+
+
+    def LoadFromSource(self, modID, source):
+        self.modules[modID][1] = source
+        self.LoadDict(modID)
+
+
+    def LoadDict(self, modID):
+        if self.name != __name__:
+            source = self.modules[modID][1]
+            #description = self.modules[modID][3]
+            description = self.modules[modID][2]
+
+            try:
+                self.modules[modID][0] = {}
+                code = compile(source, description, "exec")        
+                exec code in self.modules[modID][0]
+            except:
+                self.modules[modID][4] = DemoError(sys.exc_info())
+                self.modules[modID][0] = None
+            else:
+                self.modules[modID][4] = None
+
+
+    def SetActive(self, modID):
+        if modID != modOriginal and modID != modModified:
+            raise LookupError
+        else:
+            self.modActive = modID
+
+
+    def GetActive(self):
+        dict = self.modules[self.modActive][0]
+        if dict is None:
+            return None
+        else:
+            return ModuleDictWrapper(dict)
+
+
+    def GetActiveID(self):
+        return self.modActive
+
+    
+    def GetSource(self, modID = None):
+        if modID is None:
+            modID = self.modActive
+        return self.modules[modID][1]
+
+
+    def GetFilename(self, modID = None):
+        if modID is None:
+            modID = self.modActive
+        return self.modules[self.modActive][2]
+
+
+    def GetErrorInfo(self, modID = None):
+        if modID is None:
+            modID = self.modActive
+        return self.modules[self.modActive][4]
+
+
+    def Exists(self, modID):
+        return self.modules[modID][1] != ""
+
+
+    def UpdateFile(self, modID = None):
+        """Updates the file from which a module was loaded
+        with (possibly updated) source"""
+        if modID is None:
+            modID = self.modActive
+
+        source = self.modules[modID][1]
+        filename = self.modules[modID][2]
+
+        try:        
+            file = open(filename, "wt")
+            file.write(source)
+        finally:
+            file.close()
+
+
+    def Delete(self, modID):
+        if self.modActive == modID:
+            self.SetActive(0)
+
+        self.modules[modID][0] = None
+        self.modules[modID][1] = ""
+        self.modules[modID][2] = ""
+
+
+#---------------------------------------------------------------------------
+
+class DemoError:
+    """Wraps and stores information about the current exception"""
+    def __init__(self, exc_info):
+        import copy
+        
+        excType, excValue = exc_info[:2]
+        # traceback list entries: (filename, line number, function name, text)
+        self.traceback = traceback.extract_tb(exc_info[2])
+
+        # --Based on traceback.py::format_exception_only()--
+        if type(excType) == types.ClassType:
+            self.exception_type = excType.__name__
+        else:
+            self.exception_type = excType
+
+        # If it's a syntax error, extra information needs
+        # to be added to the traceback
+        if excType is SyntaxError:
+            try:
+                msg, (filename, lineno, self.offset, line) = excValue
+            except:
+                pass
+            else:
+                if not filename:
+                    filename = "<string>"
+                line = line.strip()
+                self.traceback.append( (filename, lineno, "", line) )
+                excValue = msg
+        try:
+            self.exception_details = str(excValue)
+        except:
+            self.exception_details = "<unprintable %s object>" & type(excValue).__name__
+
+        del exc_info
+        
+    def __str__(self):
+        ret = "Type %s \n \
+        Traceback: %s \n \
+        Details  : %s" % ( str(self.exception_type), str(self.traceback), self.exception_details )
+        return ret
+
+#---------------------------------------------------------------------------
+
+class DemoErrorPanel(wx.Panel):
+    """Panel put into the demo tab when the demo fails to run due  to errors"""
+
+    def __init__(self, parent, codePanel, demoError, log):
+        wx.Panel.__init__(self, parent, -1)#, style=wx.NO_FULL_REPAINT_ON_RESIZE)
+        self.codePanel = codePanel
+        self.nb = parent
+        self.log = log
+
+        self.box = wx.BoxSizer(wx.VERTICAL)
+
+        # Main Label
+        self.box.Add(wx.StaticText(self, -1, "An error has occurred while trying to run the demo")
+                     , 0, wx.ALIGN_CENTER | wx.TOP, 10)
+
+        # Exception Information
+        boxInfo      = wx.StaticBox(self, -1, "Exception Info" )
+        boxInfoSizer = wx.StaticBoxSizer(boxInfo, wx.VERTICAL ) # Used to center the grid within the box
+        boxInfoGrid  = wx.FlexGridSizer(0, 2, 0, 0)
+        textFlags    = wx.ALIGN_RIGHT | wx.LEFT | wx.RIGHT | wx.TOP
+        boxInfoGrid.Add(wx.StaticText(self, -1, "Type: "), 0, textFlags, 5 )
+        boxInfoGrid.Add(wx.StaticText(self, -1, demoError.exception_type) , 0, textFlags, 5 )
+        boxInfoGrid.Add(wx.StaticText(self, -1, "Details: ") , 0, textFlags, 5 )
+        boxInfoGrid.Add(wx.StaticText(self, -1, demoError.exception_details) , 0, textFlags, 5 )
+        boxInfoSizer.Add(boxInfoGrid, 0, wx.ALIGN_CENTRE | wx.ALL, 5 )
+        self.box.Add(boxInfoSizer, 0, wx.ALIGN_CENTER | wx.ALL, 5)
+       
+        # Set up the traceback list
+        # This one automatically resizes last column to take up remaining space
+        from ListCtrl import TestListCtrl
+        self.list = TestListCtrl(self, -1, style=wx.LC_REPORT  | wx.SUNKEN_BORDER)
+        self.list.Bind(wx.EVT_LEFT_DCLICK, self.OnDoubleClick)
+        self.list.Bind(wx.EVT_LIST_ITEM_SELECTED, self.OnItemSelected)
+        self.list.InsertColumn(0, "Filename")
+        self.list.InsertColumn(1, "Line", wx.LIST_FORMAT_RIGHT)
+        self.list.InsertColumn(2, "Function")
+        self.list.InsertColumn(3, "Code")
+        self.InsertTraceback(self.list, demoError.traceback)
+        self.list.SetColumnWidth(0, wx.LIST_AUTOSIZE)
+        self.list.SetColumnWidth(2, wx.LIST_AUTOSIZE)
+        self.box.Add(wx.StaticText(self, -1, "Traceback:")
+                     , 0, wx.ALIGN_CENTER | wx.TOP, 5)
+        self.box.Add(self.list, 1, wx.GROW | wx.ALIGN_CENTER | wx.ALL, 5)
+        self.box.Add(wx.StaticText(self, -1, "Entries from the demo module are shown in blue\n"
+                                           + "Double-click on them to go to the offending line")
+                     , 0, wx.ALIGN_CENTER | wx.BOTTOM, 5)
+
+        self.box.Fit(self)
+        self.SetSizer(self.box)
+
+
+    def InsertTraceback(self, list, traceback):
+        #Add the traceback data
+        for x in range(len(traceback)):
+            data = traceback[x]
+            list.InsertStringItem(x, os.path.basename(data[0])) # Filename
+            list.SetStringItem(x, 1, str(data[1]))              # Line
+            list.SetStringItem(x, 2, str(data[2]))              # Function
+            list.SetStringItem(x, 3, str(data[3]))              # Code
+            
+            # Check whether this entry is from the demo module
+            if data[0] == "<original>" or data[0] == "<modified>": # FIXME: make more generalised
+                self.list.SetItemData(x, int(data[1]))   # Store line number for easy access
+                # Give it a blue colour
+                item = self.list.GetItem(x)
+                item.SetTextColour(wx.BLUE)
+                self.list.SetItem(item)
+            else:
+                self.list.SetItemData(x, -1)        # Editor can't jump into this one's code
+       
+
+    def OnItemSelected(self, event):
+        # This occurs before OnDoubleClick and can be used to set the
+        # currentItem. OnDoubleClick doesn't get a wxListEvent....
+        self.currentItem = event.m_itemIndex
+        event.Skip()
+
+        
+    def OnDoubleClick(self, event):
+        # If double-clicking on a demo's entry, jump to the line number
+        line = self.list.GetItemData(self.currentItem)
+        if line != -1:
+            self.nb.SetSelection(1) # Switch to the code viewer tab
+            wx.CallAfter(self.codePanel.JumpToLine, line-1, True)
+        event.Skip()
+        
+
+#---------------------------------------------------------------------------
+
+class DemoTaskBarIcon(wx.TaskBarIcon):
+    TBMENU_RESTORE = wx.NewId()
+    TBMENU_CLOSE   = wx.NewId()
+    TBMENU_CHANGE  = wx.NewId()
+    TBMENU_REMOVE  = wx.NewId()
+    
+    def __init__(self, frame):
+        wx.TaskBarIcon.__init__(self)
+        self.frame = frame
+
+        # Set the image
+        icon = self.MakeIcon(images.getWXPdemoImage())
+        self.SetIcon(icon, "wxPython Demo")
+        self.imgidx = 1
+        
+        # bind some events
+        self.Bind(wx.EVT_TASKBAR_LEFT_DCLICK, self.OnTaskBarActivate)
+        self.Bind(wx.EVT_MENU, self.OnTaskBarActivate, id=self.TBMENU_RESTORE)
+        self.Bind(wx.EVT_MENU, self.OnTaskBarClose, id=self.TBMENU_CLOSE)
+        self.Bind(wx.EVT_MENU, self.OnTaskBarChange, id=self.TBMENU_CHANGE)
+        self.Bind(wx.EVT_MENU, self.OnTaskBarRemove, id=self.TBMENU_REMOVE)
+
+
+    def CreatePopupMenu(self):
+        """
+        This method is called by the base class when it needs to popup
+        the menu for the default EVT_RIGHT_DOWN event.  Just create
+        the menu how you want it and return it from this function,
+        the base class takes care of the rest.
+        """
+        menu = wx.Menu()
+        menu.Append(self.TBMENU_RESTORE, "Restore wxPython Demo")
+        menu.Append(self.TBMENU_CLOSE,   "Close wxPython Demo")
+        menu.AppendSeparator()
+        menu.Append(self.TBMENU_CHANGE, "Change the TB Icon")
+        menu.Append(self.TBMENU_REMOVE, "Remove the TB Icon")
+        return menu
+
+
+    def MakeIcon(self, img):
+        """
+        The various platforms have different requirements for the
+        icon size...
+        """
+        if "wxMSW" in wx.PlatformInfo:
+            img = img.Scale(16, 16)
+        elif "wxGTK" in wx.PlatformInfo:
+            img = img.Scale(22, 22)
+        # wxMac can be any size upto 128x128, so leave the source img alone....
+        icon = wx.IconFromBitmap(img.ConvertToBitmap() )
+        return icon
+    
+
+    def OnTaskBarActivate(self, evt):
+        if self.frame.IsIconized():
+            self.frame.Iconize(False)
+        if not self.frame.IsShown():
+            self.frame.Show(True)
+        self.frame.Raise()
+
+
+    def OnTaskBarClose(self, evt):
+        self.frame.Close()
+
+
+    def OnTaskBarChange(self, evt):
+        names = [ "WXPdemo", "Mondrian", "Pencil", "Carrot" ]                  
+        name = names[self.imgidx]
+        
+        getFunc = getattr(images, "get%sImage" % name)
+        self.imgidx += 1
+        if self.imgidx >= len(names):
+            self.imgidx = 0
+            
+        icon = self.MakeIcon(getFunc())
+        self.SetIcon(icon, "This is a new icon: " + name)
+
+
+    def OnTaskBarRemove(self, evt):
+        self.RemoveIcon()
+
+
+#---------------------------------------------------------------------------