Combo Box has invisible 'focus' on first element when opened the first time

Make a combo box with elements “a”,“b” and “c”.
Set “c” to selected.
Open the Combo Box with a mouse click.
Press “Down”-Arrow key.

Notice that “b” is now selected. (Because there was an invisible focus on “a” and it moved down from “a” to “b”.

Restart Game.
Open the Combo Box with a mouse click.
Press “Up”-Arrow key.

Notice that the list will close. (Because there was an invisible focus on “a” and the navigation moved up out of the list and the focus was lost)

Hello,

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Thanks