private IElement GetElement(IGeometry geometry, double size, IStyleGalleryItem styleGalleryItem)
{
IElement element;
IMarkerElement markerElement = new MarkerElementClass();
element = markerElement as IElement;
IMarkerSymbol markerSymbol = styleGalleryItem.Item as IMarkerSymbol;
markerSymbol.Size = size;
element.Geometry = geometry;
markerElement.Symbol = markerSymbol;
return element;
}