❔ ASP.NET, C#, Composite Server Control

Hi, i start with development of my custom GridView control with implementation all features that i made in my module (DNN) but now i am stacked with properties. I define Property Columns and DataControlFieldCollectionEditorForm and in Design Mode i can finnaly opet editor and add for example BoundField, but when I close Dialog, code with new Columns are not refreshed and after reloading .aspx file Columns are not exists. I buy books Advanced Asp.Net Ajax Server Controls, ASP.NET 4.5 in C#, .... but there is only 1 or 2 chapters where i cannot find something about that, also search on google but without success. here is parts of my code, so if anybody have wish i will be grateful to him. namespace ServerControls { [ AspNetHostingPermission(SecurityAction.Demand, Level = AspNetHostingPermissionLevel.Minimal), AspNetHostingPermission(SecurityAction.InheritanceDemand, Level = AspNetHostingPermissionLevel.Minimal), ToolboxData("<{0}:myGridView runat=server></{0}:myGridView>") ] //[ParseChildren(true)] //[PersistChildren(false)] [Designer(typeof(myGridViewDesigner))] public class myGridView : CompositeControl { [ Category("myGrid"), DefaultValue((string)null), DesignerSerializationVisibility(DesignerSerializationVisibility.Content),
Editor(typeof(myGridDataControlFieldCollectionEditorForm), typeof(UITypeEditor)), // Custom defined in file myGridDataControlFieldCollectionEditorForm.cs PersistenceMode(PersistenceMode.InnerProperty) ] public DataControlFieldCollection Columns { get { EnsureChildControls(); return gridView.Columns; } } ........ code ..... protected override void CreateChildControls() { EnsureChildControls(); ...... rest of code } ......... code ..... }