Window filter wont work on child windows

[Gintaras]

My macro that works:
Macro FF close tab
Trigger F2 /FIREFOX     

Code:

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out "macro 'FF close tab' started"

;set focus to firefox, because Flash player may have it, and then Ctrl+W would not work
int w=win
Acc a.Find(w "DOCUMENT" "" "" 0x3010 2)
a.Select(1)

key Cw ;;Ctrl+W

Don't need a filter function. Just set program FIREFOX, like here. But with filter function also works, tested.