Galaxy GT-P1000, in recovery mode, which button is "Home Key"? In the Galaxy GT-P1000 Tab, when you're in "Recovery Mode", Volume Up &amp; Down is used for scrolling. But which button is referred to as Ok or Home Key to select?

As far as I know, the Menu Key, Home Key, and Back Key are soft keys that only light up after a full Boot, while in Recovery Mode, these three keys do not come up (lights up).

Right now, after successfully flashing my GT-P1000 stock rom, the instructions says that I should go into recovery mode by pressing Volume-Up button together with Power button and enter the recovery mode and use the Volume up and Down to scroll to "wipe/factory reset" to complete my upgrade. I could not find the "Home Key" that I needed select that option after scrolling to "wipe/factory reset" and my Tab won't boot fully either.

I need these answers quickly to get my Tab working. At the moment, the Tab continues to loop back to rebooting around the Samsung Logo.
Does it have a physical power button? Usually, that is the OK button in recovery mode.