Hi,

Most likely, this problem appears because the PointF struct doesn't have
TypeConverter attrubute (the Point class uses PointConverter). Most likely
you may write you're own TypeConverter (descendant from the PointConverter
or TypeConverter) and add attribute to your property.

PointF pf;
       [DesignerSerializationVisibility(DesignerSerializationVisibility.Content),
EditorBrowsable(EditorBrowsableState.Advanced),
TypeConverter(typeof(PointConverter))]
       public PointF Pf {
           get { return pf; }
           set { pf = value; }
       }

Thanks,
Andrew