title: tkinter widget not showing up
body: <p>I just started learning python and tkinter earlier today and I cannot get any widgets to show up in the window.  It has the name I gave it and the window itself shows up when I run the program, but no widgets appear, nor does the background color.</p>
  
  <pre><code>import Tkinter
  
  class mainthing(Tkinter.Tk):
     def _init_(self,parent):
        Tkinter.Tk.__init__(self,parent)
        self.parent = parent
        self.initialize()
  
     def initialize(self):
        self.grid(bg="#001a00")
  
        self.topEntry = Tkinter.Entry(self, bg = "#006600", fg = "#00ff00")
        self.topEntry.grid(column=0, row=1, sticky="EW")
        topEntry.pack()
  
        yesBut = Tkinter.Button(self, text="Yes")
        yesBut.grid(column=1, row=1)
  
        query = Tkinter.Label(self, fg="#00ff00", bg="#001a00", anchor="W")
        query.grid(column=1, row=0, columnspan=2, sticky="EW")
  
  if __name__ == "__main__":   
     app = mainthing(None)
     app.title("RUN ON START TEST")
     app.mainloop()
  </code></pre>
  
  <p>Any help would be appreciated.  </p>