How to pass a table with checkboxes

Hi All,

I am currently writing a BSP showing the contents of an internal table ITAB

the first column of which is a mark field shown as a checkbox.

The problem I have is that no matter what I try, if I mark some of the checkboxes,

I am not able to see the result on Event OnInputProcessing.

I thought, SAP's tutorial_4 should do something similat, but I was not able to get it running.

Can somebody help me?

Thanks and best regards,

Juergen