Help with Selection Screen

Hi Experts,

I have two selection screen blocks in my selection screen.

1) TB1 - which contains a list box

2) TB2 - which contains parameters and select options.

Initially both TB1 and TB2 are active for user entry. If the values entered into the selection screen block TB2 do not result in any ouput, an error is throwing.  I need the selection blocks TB2 as well as TB1 active after error throwing. But what happens now is , only TB1 is getting activated and TB2 is not shown on the selection screen. So what code i have to write after the internal table is initial so as to enable both the selection blocks.

     IF IT_FINOVR IS INITIAL.

-------------------> ?

     MESSAGE 'No Data Exists for the Input' TYPE 'S' DISPLAY LIKE 'E'.

   ENDIF.