メニュー選択の処理を実装

メニュー選択したときの処理を書くにはどうすればいいか。
メニューの作成はデザイン画面で行う。メニューアイテムごとに選択されたとき（Click）のイベントを登録する。
例えば、コードを以下のように書く。

import System.Drawing
import System.Windows.Forms

from System.Drawing import *
from System.Windows.Forms import *

class MainForm(Form):
 def __init__(self):
  self.InitializeComponent()
 
 def InitializeComponent(self):
  self._label1 = System.Windows.Forms.Label()
  self._menuStrip1 = System.Windows.Forms.MenuStrip()
  self._fileToolStripMenuItem = System.Windows.Forms.ToolStripMenuItem()
  self._list1ToolStripMenuItem = System.Windows.Forms.ToolStripMenuItem()
  self._list2ToolStripMenuItem = System.Windows.Forms.ToolStripMenuItem()
  self._editToolStripMenuItem = System.Windows.Forms.ToolStripMenuItem()
  self._edit1ToolStripMenuItem = System.Windows.Forms.ToolStripMenuItem()
  self._edit2ToolStripMenuItem = System.Windows.Forms.ToolStripMenuItem()
  self._menuStrip1.SuspendLayout()
  self.SuspendLayout()
  #
  # label1
  #
  self._label1.Font = System.Drawing.Font("MS UI Gothic", 12, System.Drawing.FontStyle.Regular, System.Drawing.GraphicsUnit.Point, 128)
  self._label1.Location = System.Drawing.Point(37, 138)
  self._label1.Name = "label1"
  self._label1.Size = System.Drawing.Size(133, 23)
  self._label1.TabIndex = 1
  self._label1.Text = """None is selected.
"""
  #
  # menuStrip1
  #
  self._menuStrip1.Items.AddRange(System.Array[System.Windows.Forms.ToolStripItem](
   [self._fileToolStripMenuItem,
   self._editToolStripMenuItem]))
  self._menuStrip1.Location = System.Drawing.Point(0, 0)
  self._menuStrip1.Name = "menuStrip1"
  self._menuStrip1.Size = System.Drawing.Size(284, 26)
  self._menuStrip1.TabIndex = 2
  self._menuStrip1.Text = "menuStrip1"
  #
  # fileToolStripMenuItem
  #
  self._fileToolStripMenuItem.DropDownItems.AddRange(System.Array[System.Windows.Forms.ToolStripItem](
   [self._list1ToolStripMenuItem,
   self._list2ToolStripMenuItem]))
  self._fileToolStripMenuItem.Name = "fileToolStripMenuItem"
  self._fileToolStripMenuItem.Size = System.Drawing.Size(40, 22)
  self._fileToolStripMenuItem.Text = "File"
  #
  # list1ToolStripMenuItem
  #
  self._list1ToolStripMenuItem.Name = "list1ToolStripMenuItem"
  self._list1ToolStripMenuItem.Size = System.Drawing.Size(152, 22)
  self._list1ToolStripMenuItem.Text = "List 1"
  self._list1ToolStripMenuItem.Click += self.List1ToolStripMenuItemClick
  #
  # list2ToolStripMenuItem
  #
  self._list2ToolStripMenuItem.Name = "list2ToolStripMenuItem"
  self._list2ToolStripMenuItem.Size = System.Drawing.Size(152, 22)
  self._list2ToolStripMenuItem.Text = "List 2"
  self._list2ToolStripMenuItem.Click += self.List2ToolStripMenuItemClick
  #
  # editToolStripMenuItem
  #
  self._editToolStripMenuItem.DropDownItems.AddRange(System.Array[System.Windows.Forms.ToolStripItem](
   [self._edit1ToolStripMenuItem,
   self._edit2ToolStripMenuItem]))
  self._editToolStripMenuItem.Name = "editToolStripMenuItem"
  self._editToolStripMenuItem.Size = System.Drawing.Size(42, 22)
  self._editToolStripMenuItem.Text = "Edit"
  #
  # edit1ToolStripMenuItem
  #
  self._edit1ToolStripMenuItem.Name = "edit1ToolStripMenuItem"
  self._edit1ToolStripMenuItem.Size = System.Drawing.Size(110, 22)
  self._edit1ToolStripMenuItem.Text = "Edit-1"
  self._edit1ToolStripMenuItem.Click += self.Edit1Click
  #
  # edit2ToolStripMenuItem
  #
  self._edit2ToolStripMenuItem.Name = "edit2ToolStripMenuItem"
  self._edit2ToolStripMenuItem.Size = System.Drawing.Size(110, 22)
  self._edit2ToolStripMenuItem.Text = "Edit-2"
  self._edit2ToolStripMenuItem.Click += self.Edit2Click
  #
  # MainForm
  #
  self.ClientSize = System.Drawing.Size(284, 188)
  self.Controls.Add(self._label1)
  self.Controls.Add(self._menuStrip1)
  self.MainMenuStrip = self._menuStrip1
  self.Name = "MainForm"
  self.Text = "test"
  self._menuStrip1.ResumeLayout(False)
  self._menuStrip1.PerformLayout()
  self.ResumeLayout(False)
  self.PerformLayout()

 def List1ToolStripMenuItemClick(self, sender, e):
  self._label1.Text = "List 1 selected"
  
 def List2ToolStripMenuItemClick(self, sender, e):
  self._label1.Text = "List 2 selected"
  
 def Edit1Click(self, sender, e):
  self._label1.Text = "Edit 1 selected"
  
 def Edit2Click(self, sender, e):
  self._label1.Text = "Edit 2 selected"

実行結果は以下の通り。