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* [x] I have read the [Contributing Guidelines](https://github.com/electron/electron/blob/master/CONTRIBUTING.md) for this project.
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* [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/submenu_button.h
void GetAccessibleNodeData(ui::AXNodeData* node_data) override;
  
  void PaintButtonContents(gfx::Canvas* canvas) override;
  
  std::unique_ptr<views::InkDropRipple> CreateInkDropRipple() const override;
  std::unique_ptr<views::InkDrop> CreateInkDrop() override;
 private:
  bool GetUnderlinePosition(const base::string16& text,
                            base::char16* accelerator,
                            int* start,
                            int* end) const;
  void GetCharacterPosition(const base::string16& text,
                            int index,
                            int* pos) const;
  base::char16 accelerator_ = 0;
  bool show_underline_ = false;
  int underline_start_ = 0;
  int underline_end_ = 0;
  int text_width_ = 0;
  int text_height_ = 0;
  SkColor underline_color_ = SK_ColorBLACK;
  SkColor background_color_;
  DISALLOW_COPY_AND_ASSIGN(SubmenuButton);
};
}  
#endif