The focus style of UIO input fields doesn't respond to UIO themes

1. Open The preferences framework demo;
2. Open UIO and focus on any input field such as "line space";
3. The black border shows around the field as the focus style;
4. Select a contrast theme;
5. Close and reopen UIO;
6. Focus on any input field such as "line space";
7. The black border shows again and doesn't respond to the selected theme.

The color of the border should respond to the selected contrast theme. The black border becomes invisible when a theme with the black background color is selected.