[Tkinter] Getting the Respective Value

[Vicolas]

from tkinter import *
import Pmw

class Message:
    def __init__(self):
        self.root = Tk()
        self.build_Message()
        self.root.mainloop()

    def build_Message(self):
        self.entry = self.combobox =  None
        self.messages = {'Help': 'Save current file',
                         'Userevent': 'Saving file "foo"',
                         'Busy': 'Busy deleting all files from file system ...',
                         'Systemevent': 'File "foo" saved',
                         'Usererror': 'Invalid file name "foo/bar"',
                         'Systemerror': 'Failed to save file: file system full',
                         }
        self.combobox = Pmw.ComboBox(self.root, labelpos=N, label_text='Message Type',
                                dropdown=False,
                                listbox_relief=SUNKEN,
                                listbox_font = 'tahoma 10 bold',
                                scrolledlist_items = self.messages.keys(),
                                selectioncommand = self.enter,
                                listbox_background='grey')
        self.combobox.pack(fill=X,padx=5,pady=5)
        self.entry = Pmw.MessageBar(self.root,labelpos=W,label_text='Status:',entry_width=30)
        self.entry.pack(fill=X,padx=5,pady=5)

    def enter(self,event):
        self.combobox.configure(label_text=event)
        for k,v in self.messages.items():
            self.entry.helpmessage(v)

if __name__=="__main__":
    Message()

Please how can I click on the scrolled list item 'keys' and get the respective 'values' from 'self.message' dictionary variable displayed in my Pmw MessageBar Widget. Thanks