Tabstrip with mandatory fields(disabling)

Hi,

I have created selection screen with 2 tab stips. There are some mandatory fields on both the strips. Suppose i want to navigate to Strip to with out filling mandatory fields in strip one, the program will not allow. How can i achieve this. Can we disable madatory fields dynamically???

If i click on Strip 2 mandatrory fields on Strip 1 should be disabled and vice versa.

Provide me some solutions.