Hi Srikar,
with release PPM 5.0 the entry and navigation was changed. As you said the WD component DPR_MAINFRAME is obsolet as well as CPROJECTS.
There are now two WD applications that communicate: For the entry (e.g. dashboards) it is INM_WORKCENTER_APP and the application for editing/viewing projects CPROJECTS_FPM.
They are all wrapped with the FPM framework now.
br,
Peter