Hi Salim,
please refer below
https://www-secure.symantec.com/connect/forums/dlp-agent-popup-customization#comment-8393421
https://www-secure.symantec.com/connect/forums/dlp-110111-endpoint-agent-scanning-pop#comment-6080301
https://www-secure.symantec.com/connect/ideas/symantec-dlp-agent-enhancement