Android Question ULV Fire TV / external keybord

i use ULV on Fire Tv

have a list with 50 Items.
Select the first row.
if i press the down Key (keycode 20) the next row is selected.
if i press again the down key the '
Activity_KeyPress
is not fired again

but the internal Focus is on the next row
i' see that by pressing Key 'ok' (Keycode 23)

if i set Focus to line 40 (last row(50) is displayed on the Screen)
then the Activity_KeyPress Event
is fired again


maybe is ist possible to get an Event if the internal conter of ULV is changed ?

Regards Frank