The listvariable, textvariable and so forth have to be Tkinter
variables, not Python variables.

The following program worked for me in
>>> Tkinter._tkinter.TK_VERSION; sys.version
'8.5'
'2.6.4 (r264:75706, Dec  7 2009, 18:43:55) \n[GCC 4.4.1]'

#!/usr/bin/python
#----
from Tkinter import *

app = Tk()
lv = Variable(app)
lv.set(("Roads", "Field Observations", "Railroads", "Work Areas"))
l = Listbox(app, listvariable=lv, height=3)
l.pack()
app.mainloop()
#----

Jeff
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