Finding a hidden Button [closed]

Question

I played in the past on partypoker and worte my own window arranger. it arranged the windows based on a visible button, but today i switched to a different room.

the problem is that i cant find the button with spy++. spy++ doesnt recognize that there is a button. some buttons are findable with spy++, but not the one i need

any ideas how i can find this hidden button ?