public GMapMarkerRect(PointLatLng p)
: base(p)
{
Pen.DashStyle = DashStyle.Dash;
// do not forget set Size of the marker
// if so, you shall have no event on it ;}
Size = new System.Drawing.Size(50, 50);
Offset = new System.Drawing.Point(-Size.Width/2, -Size.Height/2 - 20);
}