public Task<IKnowledgeGraphInvestigationPane> OpenInvestigationPaneAsync()

{
  // open an existing investigation
  var investigationProjectItems = Project.Current.GetItems<KnowledgeGraphInvestigationProjectItem>();
  var investigationProjectItem = investigationProjectItems.FirstOrDefault(ipi => ipi.Name.Equals("myInvestigation"));
  await QueuedTask.Run(() =>
  {
    KnowledgeGraphInvestigation investigation = investigationProjectItem.GetInvestigation();
    ProApp.Panes.CreateInvestigationPaneAsync(investigation);


    // or 
    investigation.OpenViewAsync();
  });

  // or 
  investigationProjectItem.OpenInvestigationPaneAsync();
}