Hi ThaveshinP,
The report tab, if I've understood correctly is now the monitoring Tab within the UMC.
If you navigate to the UMC consoile and select "Unified Management Console" on the top right (NPIC1), you'll get a drop down called "Server" this is the path to the DCS environment (NPIC2).
Selecting Server will take you to the DCS environment. Select Monitor, this will allow you to report on and monitor the prevention / detection events within DCS (NPIC3).
If you can't see Server then your DCS will need reconfigured.
I've attached some screen shots to illustrate,
hope this helps.
Kev