[DefaultValue("#FFFEB8"), Description("Gösterilecek kontrolun arkaplan rengini belirler. Başlangıç değeri limon sarısıdır.")] [TypeConverterAttribute(typeof(WebColorConverter))] public System.Drawing.Color ArkaRenk { get; set; } This is Turkish code but in my code in first line my aim is to describe which color my Web Control Backcolor so i added to attribute my property above [TypeConverterAttribute(typeof(WebColorConverter))] it enabled to my prop select easly. I can also add this attribute to describe what i want from user or devoloper and what he/she should do ,if they don't select no color i give the DefaultValue. $0 [DefaultValue("#FFFEB8"), Description("Gösterilecek kontrolun arkaplan rengini belirler. Başlangıç değeri limon sarısıdır.")] Thanks For ..Rta