This class is an abstract superclass for widgets offering the ability to pick items from a pre-built list. The list is usually hidden, but a button on the right of this widgets makes it pop up. This widget is thus composed of three parts: an unspecified text widget (shown on the left of the button and always visible), the button widget (shown on the right, it depicts a down arrow, and is always visible), and the pop-up list widget.
|• BLOX.BDropDown-list box accessing:||(instance)|
|• BLOX.BDropDown-widget protocol:||(instance)|