TKinter question - A combo box / menu question

[Paul Sage]

First, let me apologize for sending this in HTML the first time.  I have
had a few responses on this, but nothing turns up.   Basically, I want
to pop-up a ComboDialogBox as a result of a Menu selection.  What I am
doing is creating the ComboDialogBox everytime it gets to the "command"
portion of the Menu option.  
 
Here is most of the relevant code:
 
class mainWindow:
  #Build the components into the main window
  def __init__(self, master):
    # Begin creation of the main menu items here.
    # File section.
    mbar = Menu(master, tearoff=0)
    master['menu'] = mbar
    frameForDialog = frame(master, N)
    file_menu = Menu(mbar, tearoff=0)
    file_menu.add_command(label='Load Form',
command=self.open_file(frameForDialog))
    file_menu.add_command(label='Save Form', command=self.save_file)
    file_menu.add_command(label='New Form', command=self.new_file)
    file_menu.add_separator()
    file_menu.add_command(label='Quit', command=self.quit_file)
    mbar.add_cascade(label='File', underline=0, menu=file_menu)
    # End top pull down menu selections.
    
    statEditorFrame = frame(master, N)
    statEditor = StatEditor(statEditorFrame)
    
  def open_file(self, parent):
      #Need the listofcharacters to be a tuple sequence.
      from char_edit_combo_load import *
      forms = []
      listOfCharacters = tuple(getFiles(forms))
      dialog = Pmw.ComboBoxDialog(parent, title = "Character Load",
                                  buttons = ('OK', 'Cancel'),
defaultbutton = 'OK',
                                  combobox_labelpos=N,
label_text="Please select a character",
                                  scrolledlist_items=listOfCharacters,
listbox_width=22)
      dialog.withdraw()
      result=dialog.activate()
      # The function has now opened seen the selection, time to open the
file.
      if result == 'OK':
        return(readObjectFromFile(dialog.get()))
      else:
        return(None)
 
  def save_file(self):
    #This will save the file off
    print('SF: Stub')
 
  def quit_file(self):
    #This will save the file off
    print('SF: Stub')
 
  def new_file(self):
    #This will save the file off
    print('NF: Stub')
 
  def add_level(self):
    #This will save the file off
    print('SF: Stub')
 
  def subtract_level(self):
    #This will save the file off
    print('NF: Stub')
 
root=Tk()
root.title('Character Generator')
Pmw.initialise()
topWindow = mainWindow(root)
root.mainloop()
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