Tkinter GUI Question-Infinite Loop

[prquinn at gmail.com]

Greetings,

I'm trying to run a simple Tkinter program that opens a program when you click a button.  The code is listed below.  I use a command to call a program that then calls a fortran program.  However, when I click on the button, it opens the program but the menu of the program i'm calling goes into an infinite loop......the offending code seems to be in the button1Click module.

Any help is greatly appreciated.

Thanks

from Tkinter import *
import os, sys
from win32com.client import Dispatch
xlApp=Dispatch('Excel.Application')
_PSSBINPATH=r"C:\Program Files\PTI\PSSE32\PSSBIN"
os.environ['PATH']=_PSSBINPATH+';'+os.environ['PATH']
sys.path.insert(0,_PSSBINPATH)
import redirect; redirect.psse2py()
import psspy

class MyApp:
    def __init__(self, parent):
        self.myParent = parent  ### (7) remember my parent, the root
        self.myContainer1 = Frame(parent)
        self.myContainer1.pack()

        self.button1 = Button(self.myContainer1)
        self.button1.configure(text="OK", background= "green")
        self.button1.pack(side=LEFT)
        self.button1.bind("<Button-1>", self.button1Click) ### (1)

        self.button2 = Button(self.myContainer1)
        self.button2.configure(text="Cancel", background="red")
        self.button2.pack(side=RIGHT)
        self.button2.bind("<Button-1>", self.button2Click) ### (2)

    def button1Click(self,event):    ### (3)
        psspy.runiplanfile(r"C:\MNTACT\Contingency Program\work\contingency-31-4.irf")
        if self.button1["background"] == "green": ### (4)
            self.button1["background"] = "yellow"
        else:
            self.button1["background"] = "green"

    def button2Click(self, event):  ### (5)
        self.myParent.destroy()     ### (6)


root = Tk()
myapp = MyApp(root)
root.mainloop()