A dashboard is a report created with CreateNewDashboard(); once loaded it opens in the WinForms viewer just like a report.

Load and show the dashboard.
var report = StiReport.CreateNewDashboard();
report.Load("Dashboards\\DashboardChristmas.mrt");
report.Show();

How it works. Dashboards reuse the report engine, so the same load-and-show flow applies — the template just contains dashboard elements instead of bands.
На скриншоте ниже Вы можете увидеть результат выполнения данного кода:

Showing a Dashboard in the Viewer