Repro Steps:

1) Create a New Page
2) Navigate to the Data Panel (Ctrl+7), and enter the 'Enums' tab at the tab of the Panel.
3) Create a new Enum using the '+' icon at the upper-right of the Panel.
4) With the newly-created Enum selected in the Data Panel, navigate to its Properties Panel on the right of the application window, and use the '+' icon to create a series of new Enum values.
5) Double-click on the first value in the list, and input a custom name.
6) Press the [Tab] key to move the selected input field to the next line item in the list.

Observe how pressing [Tab] doesn't move the selection down to the next Enum value row.

Expected Results: Pressing [Tab] in the Data Properties moves to the next field, in the same manner as pressing [Tab] in most Properties Panels