How to Enhance ODATA Service

Hi Experts,

I am trying to enhance Work Force Viewer of My Team UI5 Application

I need to show only a few buttons and buttons logic is there in Data Provider Class(DPC) - 

As it is standard class, i am not able to edit which means i have to know the process of enhancing this ODATA & Data Provider Class

Please let me know the process of Enhancing ODATA & DPC Classes.