Nested Content Property Editor Grouping

NestedContentEditorGroupHandler.cs

public class NestedContentEditorGroupHandler : ApplicationEventHandler
{
    protected override void OnApplicationStarted(object sender, EventArgs e)
    {
        base.OnApplicationStarted(sender, e);

        var dtMap = Mapper.FindTypeMapFor<IDataTypeDefinition, DataTypeBasic>();
        dtMap?.AddAfterMapAction((s, d) =>
        {
            var src = (IDataTypeDefinition) s;
            var dst = (DataTypeBasic) d;

            if (src.PropertyEditorAlias == "Our.Umbraco.NestedContent")
            {
                dst.Group = "Nested Content";
            }
        });
    }
}

Groups all nested content editors in the umbraco property editor dialog