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### Preflight Checklist
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* [x] I have read the [Contributing Guidelines](https://github.com/electron/electron/blob/master/CONTRIBUTING.md) for this project.
* [x] I agree to follow the [Code of Conduct](https://github.com/electron/electron/blob/master/CODE_OF_CONDUCT.md) that this project adheres to.
* [x] I have searched the issue tracker for an issue that matches the one I want to file, without success.

### Issue Details

* **Electron Version:**
  * 12.0.0-beta.1 to 12.0.0-beta.6
* **Operating System:**
  * Windows 10 (2004) 
* **Last Known Working Electron version:**
  * 11.x.x (all of them)

### Expected Behavior
Click on Menu Item opens the submenu of this item

### Actual Behavior
Clicking on menu set with Menu.setApplicationMenu(Menu.buildFromTemplate(topLevelItems)); is not possible. Pressing "ALT" Highlights the menu but nothing more happens

### To Reproduce
Build Application with menu
shell/browser/ui/views/menu_bar.h
void OnBeforeExecuteCommand() override;
  void OnMenuClosed() override;
  
  bool AcceleratorPressed(const ui::Accelerator& accelerator) override;
  bool SetPaneFocus(views::View* initial_focus) override;
  void RemovePaneFocus() override;
  void OnThemeChanged() override;
 private:
  friend class MenuBarColorUpdater;
  
  const char* GetClassName() const override;
  void ButtonPressed(views::Button* source, const ui::Event& event);
  void RebuildChildren();
  void UpdateViewColors();
  void RefreshColorCache();
  SkColor background_color_;
#if defined(OS_LINUX)
  SkColor enabled_color_;
  SkColor disabled_color_;
#endif
  RootView* window_ = nullptr;
  ElectronMenuModel* menu_model_ = nullptr;
  View* FindAccelChild(base::char16 key);
  bool has_focus_ = true;
  std::unique_ptr<MenuBarColorUpdater> color_updater_;
  DISALLOW_COPY_AND_ASSIGN(MenuBar);
};
}  
#endif