StyledProperty doesn't do anything?

I’m trying to use a StyledProperty in my UserControl and the getters/setters never seem to be triggered. I saw #2280 and I added the StyleKey suggested in that issue but still no luck. Here’s my minimum example. Any advice would be appreciated.

MainWindow.axaml

<Window xmlns="https://github.com/avaloniaui"
        xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
        xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
        xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
        xmlns:local="clr-namespace:AvaloniaApplication8"
        mc:Ignorable="d" Width="150" Height="100"
        x:Class="AvaloniaApplication8.MainWindow"
        Title="AvaloniaApplication8">
  <StackPanel>
    <local:SplitButton Width="75" Options="{Binding SplitButtonOptions}" Margin="5"/>
  </StackPanel>
</Window>

MainWindow.axaml.cs

using Avalonia.Controls;
using Avalonia.Markup.Xaml;
using System.Collections.ObjectModel;

namespace AvaloniaApplication8
{
    public class MainWindow : Window
    {
        public MainWindow()
        {
            this.DataContext = this;
            InitializeComponent();
        }

        private void InitializeComponent()
        {
            AvaloniaXamlLoader.Load(this);
        }

        public ObservableCollection<string> SplitButtonOptions //The getter here is never called
        {
            get
            {
                return new ObservableCollection<string>(new[] { "Today", "Yesterday", "Tomorrow" });
            }
        }
    }
}

SplitButton.axaml

<UserControl xmlns="https://github.com/avaloniaui"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
             xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
             mc:Ignorable="d" d:DesignWidth="800" d:DesignHeight="450"
             x:Class="AvaloniaApplication8.SplitButton">
  <StackPanel>
    <Button Click="OpenContextMenu">
      <StackPanel Orientation="Horizontal">
        <TextBlock Text="Today" VerticalAlignment="Center" Margin="5,0"/>
        <Polygon Points="0,2 5,10 10,2" VerticalAlignment="Center"
                 Stroke="{Binding $parent[Window].Foreground}" Fill="{Binding $parent[Window].Foreground}" />
      </StackPanel>
    </Button>
    <Popup x:Name="popup" StaysOpen="False" PlacementMode="Bottom" PlacementTarget="{Binding #parent[Button]}">
      <ItemsControl x:Name="popupItemsList" Items="{Binding Options}">
        <ItemsControl.ItemTemplate>
          <DataTemplate>
            <TextBlock Text="{Binding .}" Margin="5"/>
          </DataTemplate>
        </ItemsControl.ItemTemplate>
      </ItemsControl>
    </Popup>
  </StackPanel>
</UserControl>

SplitButton.axaml.cs

using Avalonia;
using Avalonia.Controls;
using Avalonia.Controls.Primitives;
using Avalonia.Interactivity;
using Avalonia.Markup.Xaml;
using Avalonia.Styling;
using System;
using System.Collections.Generic;

namespace AvaloniaApplication8
{
    public class SplitButton : Panel, IStyleable
    {
        Type IStyleable.StyleKey => typeof(SplitButton);

        public SplitButton()
        {
            this.DataContext = this;
            this.InitializeComponent();
        }

        private void InitializeComponent()
        {
            AvaloniaXamlLoader.Load(this);
        }

        public void OpenContextMenu(object sender, RoutedEventArgs args)
        {
            this.FindControl<Popup>("popup").Open();
        }

        public static readonly StyledProperty<IEnumerable<string>> OptionsProperty =
            AvaloniaProperty.Register<SplitButton, IEnumerable<string>>(nameof(Options));

        public IEnumerable<string> Options //The getter and setter here never seem to be called
        {
            get
            {
                return GetValue(OptionsProperty);
            }
            set
            {
                SetValue(OptionsProperty, value);
            }
        }
    }
}

[ahopper]

The problem is you are setting DataContext to the root of the control which breaks the binding (as it is now relative to the internals of the control and not the owner), if you set the data context of the StackPanel to ‘this’ it works. It might be worth reading up on MVVM as this tends not to be an issue once you get the hang of it.

[ahopper]

just looked a bit harder and you seem to be mixing usercontrols with templated controls.