public KnowledgeGraphInvestigation Investigation {get;}

// access the currently active knowledge graph investigation view
KnowledgeGraphInvestigationView activeView = KnowledgeGraphInvestigationView.Active;
KnowledgeGraphInvestigation investigation = activeView?.Investigation;
if (investigation != null)
{
  // perform some action
}

// get the active investigation view
var iv = KnowledgeGraphInvestigationView.Active;

QueuedTask.Run(() =>
{
  // get the investigation
  var inv = iv.Investigation;

  // get the set of selected records
  var idSet = iv.GetSelectedRecords();

  // view these records in a link chart
  var map = MapFactory.Instance.CreateLinkChart("myLinkChart", new Uri(inv.ServiceUri), idSet);
  ProApp.Panes.CreateMapPaneAsync(map);
});