Event that fires when I click the back button in the header

hi,

Which event fires when I click the "Back" button in the header? I was thinking it is the backButton event but strangely that that does not fire. When I use the back button on the device, then it fires. I simply have an alert box to test. It doesn't work when I click the back button. I am using Xperia V running android 4.x

Thanks,
M&M
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