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    <p>Instead of serializing your buttons to the resource file, you could try to serialize them to the code behind. For this you need to implement a custom <code>TypeDescriptor</code> for your <code>CompactButton</code> type and there handle convertion to an <code>InstanceDescriptor</code>. Look at <a href="http://msdn.microsoft.com/en-us/library/ayybcxe5.aspx" rel="nofollow">How to Implement a TypeConverter</a>. Example:</p> <pre><code>[TypeConverter(typeof(CompactButtonTypeConverter))] public class CompactButton: ... { ... } public class CompactButtonTypeConverter: TypeConverter { public override bool CanConvertTo(ITypeDescriptorContext context, Type destinationType) { if (destinationType == typeof(InstanceDescriptor)) return true; return base.CanConvertTo(context, destinationType); } public override object ConvertTo(ITypeDescriptorContext context, CultureInfo culture, object value, Type destinationType) { if (destinationType == typeof(InstanceDescriptor) &amp;&amp; value is CompactButton) { // This assumes you have a public default constructor on your type. ConstructorInfo ctor = typeof(CompactButton).GetConstructor(); if (ctor != null) return new InstanceDescriptor(ctor, new object[0], false); } return base.ConvertTo(context, culture, value, destinationType); } } </code></pre> <p>For more information also see the <a href="http://msdn.microsoft.com/en-us/library/system.componentmodel.design.serialization.instancedescriptor.aspx" rel="nofollow">InstanceDescriptor</a> class.</p> <p><strong>UPDATE</strong>: As for your <code>UITypeEditor</code> and the CompactButtons property, you do not need a setter. Change your CompactButtons property as follows:</p> <pre><code>[DesignerSerializationVisibility(DesignerSerializationVisibility.Content), Editor(typeof(ButtonPanelXEditor), typeof(UITypeEditor))] public List&lt;CompactButton&gt; CompactButtons { get { return _compactButtons; } // _compactButtons must of course be initialized. } </code></pre> <p>Then you could implement the EditValue method of <code>UITypeEditor</code> like so:</p> <pre><code>public override object EditValue(System.ComponentModel.ITypeDescriptorContext context, IServiceProvider provider, object value) { if (context == null || provider == null) return null; var b = context.Instance as ButtonPanel; if (b == null) return value; var editorService = (IWindowsFormsEditorService) provider.GetService(typeof(IWindowsFormsEditorService)); if (editorService == null) return null; // This constructor should copy the buttons in its own list. using (var form = new FooBar(b.CompactButtons)) { if (editorService.ShowDialog(form) == DialogResult.OK &amp;&amp; context.OnComponentChanging()) { b.CompactButtons.Clear(); b.CompactButtons.AddRange(form.Buttons); context.OnComponentChanged(); } } return value; } </code></pre> <p>If your editor form is not very specialized you could maybe try out the <a href="http://msdn.microsoft.com/en-us/library/system.componentmodel.design.collectioneditor.aspx" rel="nofollow">CollectionEditor</a>.</p>
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    1. POC# Winforms Visual Studio designer cannot find custom type
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    1. COWhat do you mean by serializing to the code behind? How can I do this? Can you post a little sample code?
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    2. COThank you for providing an example. But I still don't understand how I can use this. Where does the serialization takes place? Where do I need to do that? How can I open the code behind? I'm sorry, but it sounds like Chinese for me. (and I'm from Holland :))
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    3. COCode behind for winforms is in the .Designer file, in your case you should have a Form1.Designer.cs. Therein is a partial class definition, which contains the InitializeComponent method and everything you change on the forms designer is serialized as code to that method or to the resource file if type being serialized does not support CodeDom serialization.
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