title: Setting the Windows Forms ToolStripMenuItem ShortcutKeys property to numpad key does not work
body: <p>We have the ability to define shortcut keys for Windows Forms application menu items. That way I can tell a menu item <em>File->Save</em> to have the shortcut key <kbd>Ctrl</kbd> + <kbd>S</kbd> and the menu item's handler is "magically" executed after pressing <kbd>Ctrl</kbd> + <kbd>S</kbd>. </p>
  
  <p>The trouble is with the numeric keypad keys, the <code>ShortcutKey</code> property does not accept them (I don't understand how are they different from the other acceptable keys).</p>
  
  <p>MSDN states that the property accepts type <em>System.Windows.Forms.Keys</em> (One of the Keys values. The default is None.); and an <code>InvalidEnumArgumentException</code> would be thrown when the parameter is not one of <em>Keys</em> values. But for example Keys.Divide <strong>IS</strong> one of Keys values, and yet it can't be used.</p>
  
  <p>So how can I set a menu item to have a shortcut for Numpad <code>*</code> or Numpad <code>+</code>? Do I need to handle the key in Form's <em>ProcessCmdKey</em> event? </p>