[C1Category("Appearance")]
[C1Description("ChartBorder.Thickness", "The thickness of the border, in twips.")]
[TypeConverter(typeof(PageUnitConverter))]
public double Thickness { get; set; }

<C1Category("Appearance")>
<C1Description("ChartBorder.Thickness", "The thickness of the border, in twips.")>
<TypeConverter(GetType(PageUnitConverter))>
Public Property Thickness As Double