Throbber color does not appear to change when modifying the tint value

If the user changes the tint color of the throbber widget the color of the widget does not appear to change.

1. Open the editor
2. Create new widget blueprint
3. Add a throbber widget to the designer tab
4. Change the tint value for the throbber widget
5. Notice the color of the widget does not appear to change

Expected: The color of the widget would match that of the color that was chosen
Result: The widget does not appear to change colors