IPoint centerPoint;centerPoint.Project(PageCtrl.ActiveView.FocusMap.SpatialReference);IActiveView pActiveView = PageCtrl.ActiveView.FocusMap as IActiveView;IEnvelope pEnvelope = (IEnvelope)pActiveView.Extent;pEnvelope.CenterAt(centerPoint);pActiveView.Extent = pEnvelope;pActiveView.Refresh();