c# - Persisting Design Time Properties in WinForms -

i writing stylable control windows forms. stylable mean user has greater control on appearance of control standard backcolor, forecolor etc. following code has been simplified illustrate problem

[toolboxitem(false)] public class brushproperties : component {     public color[] gradientcolors { get; set; }     public single[] gradientpositions { get; set; }     public single gradientangle { get; set; } }  [toolboxitem(false)] public class style : component {     public brushproperties background { get; set; }     public brushproperties foreground { get; set; }      public style()     {          this.background = new brushproperties();          this.foreground = new brushproperties();     } }  public class stylecontrol : control {     public style style { get; set; }      public stylecontrol()     {         this.style = new style();     } } 

when in designer can see of properties of style , of properties of each brushproperties instance. can change values well, moment build/run project, values i've assigned properties disappear. code require in order persist property values specified @ design time?

if goal have design-time support, don't need base classes component object. instead decorate classes expandableobjectconverter attribute.

the propertygrid use expandableobjectconverter attribute determine whether if should expand properties of object or not.

example:

[toolboxitem(false)] [typeconverter(typeof(expandableobjectconverter))] public class brushproperties {   public color[] gradientcolors { get; set; }   public single[] gradientpositions { get; set; }   public single gradientangle { get; set; } }  [toolboxitem(false)] [typeconverter(typeof(expandableobjectconverter))] public class style {   public brushproperties background { get; set; }   public brushproperties foreground { get; set; }    public style()   {     this.background = new brushproperties();     this.foreground = new brushproperties();   } }