Complex elements for mouse over, Mouse Out problems

Hi there! :blush:

I want to create a complex element for a mouse over effect on a map.
The form/element is not just a circle or a rectangle…
Right now I used several rectangles and created a group out of it.
On Mouse Out sometimes the fading effect stands still.

My questions:

1.) Is this the way to create a complex element? No vector tool, etc?
2.) Are there any known issues with Mouse Out to start the timeline? Any workaround?

Thanks in advance!
Cheers Micha