将子窗口保持在父级之上

Question

我想在OS X上的父级上面保留一个子窗口

我试过搜索谷歌，但我找不到任何有用的东西。

我是python和OS X的新手，所以我可能会错过一些简单的东西。

我正在使用python3.4和OS X 10.7

#!/usr/bin/python
# -*- coding: utf-8 -*-

from tkinter import *
from tkinter.ttk import *

class Example(Frame):
    def __init__(self, parent):
        Frame.__init__(self, parent)

        self.parent = parent

        self.initUI()

    def childWindow (self,parent):
        window = Toplevel(parent)

        self.style = Style()

        self.style.theme_use("default")

        window.wm_title('Child')

        message = "This is the child window"

        Label(window, text=message).pack()

        Button(window, text='Close', command=window.destroy).pack(padx=2.5,pady=2.5)

        # Lift above parent
        window.lift(aboveThis=parent) 

        # Disable parent
        window.grab_set() 

    def initUI(self):
        self.parent.title("Root")

        self.style = Style()

        self.style.theme_use("default")

        b1 = Button(self, text='Quit', command=self.quit)

        b2 = Button(self, text='test: Child Window', command=lambda: self.childWindow (self))

        b1.pack(side=LEFT,padx=2.5,pady=2.5)

        b2.pack(side=LEFT,padx=2.5,pady=2.5)

        self.pack(fill=BOTH, expand=1)

def main():
    root = Tk()

    app = Example(root)

    root.mainloop()

if __name__ == '__main__':
    main()