Goal:

• class to composite together two widgets to reduce code duplication. 

For example, various widgets have a drop down box. Combobox has a drop down, as do some ToolbarItems. And also it would be nice to have a date input field where you pressed an arrow and a DatePicker widget appeared.

a button w/a drop down menu can be created by using the DropDownContainer (  ButtonWidget,  MenuWidget)

(we could pretty easily break these out of some of the things we have if we wanted to)