Dropdown menu

![happened](https://cloud.githubusercontent.com/assets/8581347/5195154/6a2e6434-74dd-11e4-947c-dc9c5b0b472e.jpg)

MenuItem is in the sample code for the dropdown in the API, unfortunately they don't have a doc specifically for it, but it looks straightforward. For now you can probably ignore the bit about keys and maps and just put the MenuItem inside the ModalTrigger.