multiple docking toolbars

Hello,

I wanted to create multiple docking toolbars. Creating only one works. If I add a second, it will cover the menubar. When I move that toolbar, the menu is not re-displayed correctly any more. If I add a third, it does even not appear. What do I do wrong? Please take a look at the code attached. Any hints are appreciated.
(BTW: I started to work with WxPython and Python last week-end. After having read "Learning Python" and some time playing with boa, I am overwhelmed by the power of the combination (WxWindows, Python). Previously, I tried to build a GUI using MS VC++, but I gave up due to the cryptic and non-transparent character of the generated code. Prior to that, I have built GUIs using GTK+)

class CApplication(wx.Frame):
     def __init__ (self, *args, **kwds):
         kwds["style"] = wx.DEFAULT_FRAME_STYLE
         wx.Frame.__init__ (self, *args, **kwds)

         # Window
         self.SetSize((1200, 800))
         self.SetTitle(_("Application"))

         # Tool Bars
         self.ToolBar = CToolBar(self,wx.Point(0,0))
         self.LocationBar = CLocationBar(self,wx.Point(0,60))

         # Container
         self.MainSizer = wx.BoxSizer(wx.VERTICAL)

         self.SetAutoLayout(1)
         self.SetSizer(self.MainSizer)
         self.Layout()

class CLocationBar(wx.ToolBar):
     def __init__ (self, parent, position):
         wx.ToolBar.__init__(self,parent,-1, pos = position,
             style=wx.TB_HORIZONTAL|wx.TB_DOCKABLE|wx.TB_3DBUTTONS)

         self.AddControl(wx.StaticText(self, -1, _("Location"),
             style=wx.ALIGN_RIGHT))
         self.Location = wx.ComboBox(self, wx.NewId(), "", choices=[""],
             size=(150,-1), style=wx.CB_DROPDOWN|wx.EXPAND)
         self.AddControl(self.Location)
         self.Realize()

         parent.SetToolBar(self)

def item_factory(toolbar,items):
     for item in items:
         ID = wx.NewId()
         toolbar.AddLabelTool(ID, _(item[0]),
             wx.Bitmap(item[1], wx.BITMAP_TYPE_ANY), wx.NullBitmap,
                wx.ITEM_NORMAL, "", "")
         toolbar.SetToolShortHelp(ID, _(item[2]))

class CToolBar(wx.ToolBar):
     def __init__ (self, parent, position):
         wx.ToolBar.__init__(self,parent, -1, pos = position,
             style=wx.TB_HORIZONTAL|wx.TB_DOCKABLE|wx.TB_3DBUTTONS)
         parent.SetToolBar(self)

         items = [["Load", 'icons/fileopen.png', "Load" ],
                  ["Save", 'icons/filesave.png', "Save" ],
                  ["Download", 'icons/filesaveas.png', "Save As" ]]
         item_factory(self,items)

         self.SetToolBitmapSize((22, 22))
         self.Realize()