Update data one Screen to another Screen

Hello 

I have a new screen and

I call with

var graph = PXGraph.CreateInstance<CrTaskMaintv2>();

Guid noteidL = oppor.NoteID.Value; 

graph.inicializar(noteidL, oppor.BAccountID.Value    );

string screenID = "US306020";

throw new PXRedirectRequiredException(PXSiteMap.Provider.FindSiteMapNodeByScreenID(screenID).Url, graph, PXBaseRedirectException.WindowMode.NewWindow, "Tareas");

but from the new instance, I want refresh, grid of activity in CROpportunity

I review

https://community.acumatica.com/customizations-187/update-data-one-screen-to-another-screen-8152

but don't undertand