I am trying to use the @material-ui/core library in my application and want to create a nested menu. I can see that material.io specification talks about a nested menu but material-ui does not have a built in support for the same. I tried using Menu and MenuItems. Also went through the documentation, but did not find the way to create such nested menu. Basically MenuItem is not allowing me to add children inside it. Can someone help me understand how to do this?
sandbox: https://codesandbox.io/s/material-ui-nested-menu-problem-ibxoh
