public static void ZoomAndFlash(IMapControl3 mapctrl, IFeature feat)
{
MapHelper.ZoomToFeature(mapctrl.ActiveView, feat);
IGeometry shape = mapctrl.ActiveView.Extent;
(shape as ITransform2D).Scale((shape as IArea).Centroid, 1.5, 1.5);
mapctrl.ActiveView.Extent = shape.Envelope;
mapctrl.ActiveView.ScreenDisplay.UpdateWindow();
MapHelper.FlashGeometry(mapctrl, feat.ShapeCopy);
}