Can't come out of calibration window

Hi,

I am having a mini2440 7" board. After dumping the bin files to the board i
need to re calibrate the screen since touch doesn't work properly. When i
recalibrate the screen a + sign comes and i have to recalibrate touching
this sign in the middle.
My problem is i am not able to come out of this recallibration screen as it
continues to show me up this plus sign always. The only option to come out
is a reboot.

Please help..

Manoj Kumar