User must be able to quickly set the data type of DRG elements when they are created:

Acceptance criteria

• How to switch focus between name vs. data type? just by mouse?, TAB key?
• How to confirm changes? click outside? ENTER key?
• can be saved just name? without changing data type?
• can be saved just data type? without changing name?
• is that new pop-over shown always? is that shown just after node created?
• popover is navigable by keyboard, e.g. - arrows to select an entry, ENTER to confirm the selection