How to use Tk on sage?

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I run command "sage -python gui.py". In gui.py import Tkinter. but SAGE response

Traceback (most recent call last):
  File "gui.py", line 1, in <module>
     from Tkinter import*
   File "/usr/local/src/sage-4.7-linux-32bit-ubuntu_10.04_lts-i686-Linux/local/lib/python2.6/lib-tk/Tkinter.py", line 39, in <module>
     import _tkinter # If this fails your Python may not be configured for Tk
 ImportError: No module named _tkinter

how to way to solve the problem. Thank you