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    <p>Have a look at creating a UITypeEditor, i think that if you use an editor you will have more control over the list and be able to tell if the current value is null and if so you can have the editor show a blank grid or something where list items can be added or removed, you could also add a checkbox to tell the editor to return null again and set null on the property, the editor is basically a WinForm so you can do almost anything in it.</p> <pre><code>internal class GenericTypeEditor : UITypeEditor { public override object EditValue(ITypeDescriptorContext context, IServiceProvider provider, object value) { IWindowsFormsEditorService winFormEditorSvc = (IWindowsFormsEditorService)provider.GetService(typeof(IWindowsFormsEditorService)); using (MyForm editorForm = new MyForm()) { if (winFormEditorSvc.ShowDialog(editorForm) == System.Windows.Forms.DialogResult.OK) value = editorForm.ReturnObject; } return value; //this can be null if you wish } public override UITypeEditorEditStyle GetEditStyle(System.ComponentModel.ITypeDescriptorContext context) { return UITypeEditorEditStyle.Modal; } } </code></pre> <p>Then just set the attribute on your property</p> <pre><code>[EditorAttribute(typeof(GenericTypeEditor), typeof(System.Drawing.Design.UITypeEditor))] public List&lt;Inner&gt; InnerData { get; set; } </code></pre> <p>This article helped me in the past, maybe it is of help to you: <a href="http://msdn.microsoft.com/en-us/library/ms171840(v=vs.100).aspx" rel="nofollow">http://msdn.microsoft.com/en-us/library/ms171840(v=vs.100).aspx</a></p>
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    1. COThe EditorAttribute section isn't quite right, should be `EditorAttribute(typeof(GenericTypeEditor)), typeof(System.Drawing.Design.UITypeEditor))]`, and it applies to the `public List<Inner> Inner` property of my example.
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    2. CO@scott ah sorry i just copy pasted there and copied the property from Wanabrutbeer instead of yours.. i am still not used to entering code in the answer posting page so maybe i did not scroll up enough :P good point on the attribute, edited my answer...
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Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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