How do I go back 'one' with the polygonal lasso tool?

[peter_quiet]

I am carving out an error and I mis-place one of the tabs but how do I go back one, if I press escape my whole selection gets wiped out :-(

 

[ibclare]

control/command z

 

[SeniorS]

Open in menu Window/History.
There will be 20 last actions (if you have default history settings).
Find which action cause problem and press one step before (above) it.