- Electron version: 1.4.0
- Operating system: Windows 7 (x64)

I launch Electron and then press `ALT` to show menu. Now you mouse click on any top-level menu item, active menu item will NOT be changed to down state. I checked with 1.3.5, it is fine.

atom/browser/ui/views/submenu_button.h
#ifndef ATOM_BROWSER_UI_VIEWS_SUBMENU_BUTTON_H_
#define ATOM_BROWSER_UI_VIEWS_SUBMENU_BUTTON_H_
#include "ui/views/controls/button/menu_button.h"
namespace atom {
class SubmenuButton : public views::MenuButton {