#!/usr/bin/python3
import tkinter as tk
def callback_sel():
	top.destroy()
root=tk.Tk()
top=tk.Toplevel(root)
# frames
frame1=tk.Frame(top)
frame2=tk.Frame(top)
frame3=tk.Frame(top)
# text widgets
txt1=tk.Text(frame1)
txt2=tk.Text(frame2)
txt3=tk.Text(frame3)
# button
button=tk.Button(frame3,text='Выделенное',command=callback_sel)
button.bind('<Return>', lambda e: callback_sel())
button.pack(side='bottom')
# pack text widgets
txt1.pack()
txt2.pack()
txt3.pack()
# pack frames
frame1.pack()
frame2.pack()
frame3.pack()
top.wait_window()
root.mainloop()

#!/usr/bin/python3
import tkinter as tk
def callback_sel():
	top.destroy()
root=tk.Tk()
top=tk.Toplevel(root)
top.attributes('-zoomed',True)
frame1=tk.Frame(top)
frame2=tk.Frame(top)
frame3=tk.Frame(top)
txt1=tk.Text(frame1,height=15,wrap='word')
txt2=tk.Text(frame2,height=15,wrap='word')
txt3=tk.Text(frame3,height=15,wrap='word')
# button
button=tk.Button(frame3,text='Выделенное',command=callback_sel)
button.bind('<Return>', lambda e: callback_sel())
button.pack(side='bottom')
# pack text widgets
txt1.pack(expand='yes',fill='both')
txt2.pack(expand='yes',fill='both')
txt3.pack(expand='yes',fill='both')
frame1.pack(expand='yes',fill='both')
frame2.pack(expand='yes',fill='both')
frame3.pack(expand='yes',fill='both')
top.wait_window()
root.mainloop()