TKinter question - A combo box / menu question

[Paul Sage]

I am trying to build a very simple menu portion of a program.  I have
the main frame created and the menu box is a widget in that frame.  The
menu is a straight pull down menu.  However, in the "LOAD" part of the
menu where I would like to create a pop-up combo box when load is
selected from the menu.  I have created both working widgets, but every
time I execute the program, it pops up the ComboDialogBox.  I want this
box to be a part of an event, not actually being built.  Can anyone help
with this?

class TopMenuBar:
  def __init__(self, parent):
    menu_Bar = Frame(parent, relief=GROOVE, borderwidth =1)
    menu_Bar.pack(fill=X)
    FileBtn = self.player_Load_Menu(menu_Bar)
    ConfigureBtn = self.player_Configure_Menu(menu_Bar)

  def player_Load_Menu(self, menu_Bar):
    #Create the first top menu item
    CmdBtn = Menubutton(menu_Bar, text='Character Selection',
underline=0)
    CmdBtn.pack(side=LEFT)
    CmdBtn.menu = Menu(CmdBtn, tearoff=0)
    #Begin creating the items in the first top menu
    CmdBtn.menu.add_command(label="Load Form",
command=self.open_file(menu_Bar))
    CmdBtn.menu.add_command(label="Save Form", command=self.save_file)
    CmdBtn.menu.add_command(label="New Form", command=self.new_file)
    CmdBtn.menu.add('separator')
    CmdBtn.menu.add_command(label="Quit", command=self.quit_file)
    CmdBtn['menu'] = CmdBtn.menu
    return(CmdBtn)

  def player_Configure_Menu(self, menu_Bar):
    #Create the second top menu item
    CmdBtn = Menubutton(menu_Bar, text='Configure Form', underline=0)
    CmdBtn.pack(side=LEFT)
    CmdBtn.menu = Menu(CmdBtn, tearoff=0)
    #Begin creating the items in the second top menu
    CmdBtn.menu.add_command(label="Add level", command=self.add_level)
    CmdBtn.menu.add_command(label="Subtract level",
command=self.subtract_level)
    CmdBtn['menu'] = CmdBtn.menu
    return(CmdBtn)

  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)


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