Tkinter listbox question

[vedran_dekovic at yahoo.com]

Hi,
I need help about Tkinter listbox widget.I want,when somebody click on
any item(file)  in Listbox,then in new Label widget text must be
selected item from server.

my program (wrong example):

import ftputil
import Tkinter
root=Tkinter.Tk()
ftp=ftputil.FTPHost('some imaginary server')

def LabelWidget(event):
    a=Tkinter.Label(root,text=)  # Text must be only name and file
format,example: sun.gif
    a.grid()



b=Tkinter.Listbox(root)
b.insert(Tkinter.END,ftp._dir(''))
b.place()
c=Tkinter.Button(root,text='PRINT THIS FILE IN NEW LABEL WIDGET')
c.bind('<Button-1>',LabelWidget)
c.grid()
root.mainloop()


THANKS!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!