hide print button in travel request approval POWL

hi,

I need to hide the print button in approval screen of travel request POWL screen

im trying follw approach

1. debug at cl exithandler class to find any badi

2. right click on the screen and get webdynrpo componenet and see the view for any enhacement implementation

here i got SALV_WD_TABLE component name but cudnt proceed ahead of that

I am trying to folow this link on the same lines......  http://scn.sap.com/community/web-dynpro-abap

kindly help by giving some inputs

thanks

bhakti