title: Flutter - How to position the DropDownMenuItem below the DropDownMenuButton?
body: <p>I’m working with the DropdownButton and I have two questions:</p>
  
  <p>1/ Is it possible to define the height of the DropdownButton Widget ?</p>
  
  <p>2/ How to position the DropDownMenuItem to always start below the DropdownButton frame like this ?</p>
  
  <p><a href="https://i.stack.imgur.com/TUhjX.png" rel="noreferrer"><img src="https://i.stack.imgur.com/TUhjX.png" alt="position the item"></a></p>