Hide a push button on a module pool screen

1. I have created a function module in which i am calling screen 0100.

2. The FM has two import parameters Flag1 and Flag2

3. This screen 0100 has 3 PushButtons on it(say Button1 , Button2 and Button3)

4. Depending upon the parameter passed to the Flag1 and Flag2 field i have to hide or display the PushButtons

How do i achieve this?