See comments below.

Essence is the current ComboBox is a bugfarm and barely works. It needs to be replaced.

This Issue is to create a new View named DropDownList.

This comment illustrates how it can be built

#2404 (comment)

Proposed Changes/Todos

• Add OpenMenu() method to programmatically open first menu item
• Add OpenMenu(Point?) overload for custom positioning
• Update MenuBar documentation with dropdown usage pattern
• Add comprehensive unit tests (3 new tests, all passing)
• Find and replace all usages of ComboBox with this technique
• Delete ComboBox from project