You can declare a variable "down" set to 0
And then :
Gamepad : Gamepad 0 D-pad down is down
--> set variable down to 1
else
--> set variable down to 0
On layout start :
--> set variable down to 1
Variable down == 1
--> (your actions)
I could me more precise if you tell me what pressing the down button is supposed to do