how can I getting tkinter entry widget value in pygubu?
<p>I use tkinter in pygubu. I want I get value of Entry_1 widget.
the Entry_1 widget value is blue. and textvariable of Entry_1 is 'text_1'
I read pygubu document. but I don't understand.
who can know me easy please.</p>

<p>and  I Link ask.ui file to use pygubu
<a href="http://www.joinsland114.mireene.com/data/ask.ui" rel="nofollow">http://www.joinsland114.mireene.com/data/ask.ui</a></p>

<pre><code>try:
    import tkinter as tk  # for python 3
except:
    import Tkinter as tk  # for python 2
import pygubu
from tkinter import *

class Application:
    def __init__(self, master):

        #1: Create a builder
        self.builder = builder = pygubu.Builder()

        #2: Load an ui file
        builder.add_from_file('ask.ui')

        #3: Create the widget using a master as parent
        self.mainwindow = builder.get_object('Frame_1', master)

        builder.connect_callbacks(self)


root = tk.Tk()
app = Application(root)

print(app.mainwindow.getvar('text_1'))    
root.mainloop()
</code></pre>

<blockquote>
  <p>Traceback (most recent call last):   File "C:\Python34\pygubu.py", line
  25, in 
      print(app.mainwindow.getvar('text_1'))   File "C:\Python34\lib\tkinter__init__.py", line 454, in getvar
      return self.tk.getvar(name)
  _tkinter.TclError: can't read "text_1": no such variable</p>
</blockquote>