Menu bar disabled??

hi all,,

i have a mpp report where i have called 3 screen ...

say eg 100 and when gone inside 100 i have few input boxes and a 2 buttons(OK and CANCEL), when i click on OK all my default standard menu bar items r displayd when i click on cancel all the standard menu items r DIABLED .....

Wat can i do, ??

I Want to click on the CANCEL button and from menu i want to click on BACK button and need to go to my prog....whereas i am not able to do it....instead goin by TCODE now..

Thanx in advance

Rachel