Better solution (for me) changing the opacity property on hover via a custom style instead of component events (and thus no need for parent containers). Bonus: hover actions are visible in designer (preview mode). Examples attached.
base style:
opacity: 0,element state [hover]:
opacity: 0.90
Wish I could add position: absolute (for positioning on top of other flex-container objects) to the custom style instead of manually to the tooltip component style, but I guess there's a reason it's not available in the style properties GUI.
Motor Tooltip.zip (4.1 KB)