dropdown item ordering when populated from dictionary

I am asking this again since I didn't get an answer the first time I asked:

I am using a dictionary to populate a wxComboBox dropdown. The order of
the items doesn't make sense to me. For the most part, they are
alphanumericly ordered, but some are out of order. The dictionary looks
like this:

#Create a dictionary to link display value and hex value of commands
self.Dict={'\x78':'78','\x65':'65','\x60':'60',
'\x4D':'4D','\x4E':'4E','\x48':'48',
'\x6D':'6D','\x10':'10','\x1D':'1D','\x5A':'5A','T1':'T1','T2':'T2','T3':'T3','\x0E':'0E','\x49':'49','\x46':'46','\x50':'50','\x52':'52','\x67':'67','\x73':'73','\x53':'53','\x18':'18','\x58':'58','\x0C':'0C','\x57':'57','\x42':'42','\x43':'43','\x59':'59','\x4F':'4F','\x72':'72','\x77':'77','\x0D':'D','\x66':'66','\x61':'61','\x56':'56','\x47':'47','\x4B':'4B','\x46':'0F','\x0B':'0B'}
self.List=self.Dict.values()

and the dropdown is created thusly:

#Create a Command Drop Down
self.combolabel = wxStaticText(self,-1,"Please select a command:")
self.combo=wxComboBox(self, 30, " ",
                      wxPoint(wxALIGN_LEFT),
                      wxDefaultSize,
                      self.Dict.values(),wxCB_DROPDOWN)
EVT_COMBOBOX(self, 30, self.CommandCallback)

How are these items supposed to be ordered? Right now they are ordered
like this:

D,4D,0C,0E,10,18,1D,5A,0B...........

--vicki

"A pessimist sees the difficulty in every opportunity; an optimist sees
the opportunity in every difficulty."
  -- Winston Churchill