Un-lock the locking nut and tighten the springs in the trem cavity (on the back of the guitar) then retune.
If the bridge is not in the position you want, repeat either loosening or tightening these springs as necessary.
My instructors page and www.studiotrax.net for all things recording.
my toons Brought to you by Dr BadGAS
my toons Brought to you by Dr BadGAS