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Can't get ListItemUIHint to work with custom type


I followed the docs at but I can't get my custom editor to work witin a list using ListItemUIHint.

I have a custom inline block type defined as this:

[ContentType(AvailableInEditMode = false, GUID = "808cffcb-be56-4870-8804-31bfd8c2f8a3")]
public class EstateIdentifierProperty : BlockData {
    public virtual string? Identifier { get; set; }
    public virtual string? Description { get; set; }
    public virtual string? ThumbnailUrl { get; set; }

For which I have created a custom property editor which I register like this.

[EditorDescriptorRegistration(TargetType = typeof(EstateIdentifierProperty), UIHint = "EstateIdentifier")]
public class EstateIdentifierPropertyEditorDescriptor : EditorDescriptor {
    private const string _editingClient = "cool-project/editors/estate-identifier-editor";

    public EstateIdentifierPropertyEditorDescriptor() : base() {
        ClientEditingClass = _editingClient;

    public override void ModifyMetadata(ExtendedMetadata metadata, IEnumerable<Attribute> attributes) {
        ClientEditingClass = _editingClient;

        base.ModifyMetadata(metadata, attributes);

I then added this property to my page

    [Display(Name = "Single Custom Editor", Order = 4)]
    public virtual EstateIdentifierProperty? EstateIdentifier1 { get; set; }

Which in turn renders my custom editor fine as seen below.

Now I want to have multiple of these so I tried using the new "ListItemUIHintAttribute" to get this editor in a collection like this.

    public virtual IList<EstateIdentifierProperty> EstateIdentifiers { get; set; } = new List<EstateIdentifierProperty>();

But this just renders a plan editor like below.

Is this supposed to be supported with "ListItemUIHintAttribute"? If it is, what am I missing?

/ Karl-Johan Sjögren

Edited, Sep 29, 2023 9:40

It should be the name of the property on the block in this case Identifier

Sep 29, 2023 18:41

The name of the property on the block? I don't understand what you mean by that. Should I set the ListItemUIHintAttribute on the "Identifier" property in my block?

Oct 02, 2023 5:34

Yes or whatever other property you want to show on the list.  You only can show one property.

Oct 02, 2023 14:33

No lists can handle complex objects since 12.18.0 as described in There they also talk about using "ListItemUIHint" to use a custom editor for your list items which is what I'm trying to do.

Oct 03, 2023 4:33
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