Show/Hide Child Menu Vertically

• Dashboard
• [+] Sub Menu
  • Sub Menu 1
  • Sub Menu 2
  • Sub Menu 3
• [+] Sub Menu
  • Sub Menu 1
  • Sub Menu 2
  • Sub Menu 3
• [+] Sub Menu
  • Sub Menu 1
  • Sub Menu 2
  • Sub Menu 3
• Main Menu