This the default styling for a widget published to the "Drop Down" row. This row has 6 positions; read below for more info.
DropDown Now Included In Vertex
This is the S5 Ultimate Drop Down. This is a feature that is seen in several Shape 5 designs. Many have asked how to add to other designs so we decided to build this into the framework so every design from now on will have this functionality.
Be sure to read more about this new feature here:
Customize almost everything! Shadows, borders, gradient, opacity