This is reproducible on mustang b50, on all platforms.

Even after calling setFocusTraversalKeysEnabled(false) on a component, focus is getting transferred to the next component when pressing the tab key.

To reproduce:
1. Run the attached testcase
2. Press the button labeled 'Click me' - this calls setFocusTraversalKeysEnabled(false) on the text field.
3. Try traversing the focus using tab key.

If focus is getting transferred from text field to button on pressing tab, bug is reproduced.