title: Dropdown with custom input in material ui
body: <p>Is it possible to have a dropdown field but being able to add a value other than the ones suggested by the dropdown? </p>
  
  <p>Something like the <a href="http://www.material-ui.com/#/components/auto-complete" rel="noreferrer">autocomplete</a> field with showAllItems set to true and without the auto-complete functionality</p>
  
  <p><strong>Edit:</strong></p>
  
  <p>What I want to achieve is just submit the form with the custom value or the user selection from the dropdown (according to the user's choice)</p>