[Tkinter] Print if all checkboxes marked

[Kaelmi]

So I've got this code (it's not full cuz everything repeats):

from Tkinter import *
import tkMessageBox
import Tkinter

top = Tkinter.Tk()
top.wm_title("Checklist")

CheckVar1 = IntVar()
CheckVar2 = IntVar()

C1 = Checkbutton(top, text = "Underwear", variable = CheckVar1, anchor = W,  onvalue = 1, offvalue = 0, height=1, width = 40)
C2 = Checkbutton(top, text = "T-shirts", variable = CheckVar2, anchor = W, onvalue = 1, offvalue = 0, height=1, width = 40)

B1 = Tkinter.Button(top, text = "Sprawdz", command = confirm)

C1.pack()
C2.pack()

B1.pack()

top.mainloop()

What I want to do is when I press the button "Sprawdz" it will check whether all checkboxes are marked as checked. Whether they are  or not the message will appear in other gui window. How can I do that? I read something about those event handlers you mentioned above but I don't have any knowledge connected with IT and I couldn't find anything for "totally newbies". 

Thanks for response :)