title: Create a Menu inside a Menu in flexdashboard - R
body: <p>I'm creating a Dashboard in R with flexdashboard. I have a drop down menu (See Image 1). I want to create a menu inside the menu (See Image 2). It is possible with this library?</p>
  
  <p><a href="https://i.stack.imgur.com/Kc1vK.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/Kc1vK.png" alt="Image 1"></a></p>
  
  <p><a href="https://i.stack.imgur.com/imGbq.png" rel="nofollow noreferrer"><img src="https://i.stack.imgur.com/imGbq.png" alt="Image 2"></a></p>