WPF

<ListView x:Name="ProgressListView" Grid.Row="1" Grid.RowSpan="2" ItemsSource="{Binding ProgressCollection}" Background="Transparent" Panel.ZIndex="10" IsHitTestVisible="False">
<!-- Omitted WPF for the progress units -->
</ListView>

<Button Grid.Row="0" Grid.Column="1" 
Content="{wpf:MaterialIconExt Kind=WindowClose}"
Command="{Binding CloseProgressCommand}" 
Style="{StaticResource ProgressButtonStyle}" />

• I have experimented with overriding the hittest of the listview, so I can ignore hittest in code but allow the button to be pressed. This did not work, but I am still looking into this.
• I have tried fiddling with the ZIndex on the Button, but if the listview ZIndex is lower that the rest, then buttons inside it will of cause also be behind it, no matter the buttons ZIndex. Its a part of the ListView.
• I have also looked into the Adorner layer. I find that this could probably work, but it will require a complete rewrite of the logic and as I understand it is not really what it is meant for and will be very complicated.

<Canvas Grid.Row="1" Grid.RowSpan="2" VerticalAlignment="Bottom">
    <ListView x:Name="ProgressListView" ItemsSource="{Binding ProgressCollection}" Background="Transparent" Canvas.Bottom="0" BorderThickness="0">
    <!-- Content -->
</ListView>
</Canvas>

public App()
{
    AppHost = Host.CreateDefaultBuilder()
                    .ConfigureServices((hostContext, services) =>
                    {
                        services.AddSingleton<IEventAggregator, EventAggregator>();
                        services.AddSingleton<IApplicationSecurity, ApplicationSecurity>();
                        services.AddSingleton<MainWindowViewModel>();
                        services.AddSingleton<MainWindowView>();
                        services.AddSingleton<LoginViewModel>();
                        services.AddSingleton<LoginView>();
                    })
                    .Build();
}

<AssemblyName Condition="'$(Configuration)' == 'Release App1'">App1</AssemblyName>
<AssemblyName Condition="'$(Configuration)' == 'Release App2'">App2</AssemblyName>
<AssemblyName Condition="'$(Configuration)' == 'Release App3'">App3</AssemblyName>
<AssemblyName Condition="'$(Configuration)' == 'Release App4'">App4</AssemblyName>

<Image x:Name="myImage"
        Stretch="None"
        Width="15"
        Height="15" 
        HorizontalAlignment="Center"
        VerticalAlignment="Center"
        Source="/App1;component/Images/My_Image.png" />

private BitmapImage _MyImage;
public BitmapImage MyImage
{
    get { return _MyImage; }
    set
    {
        if (_MyImage != value)
        {
            _MyImage = value;
            RaisePropertyChanged("MyImage");
        }
    }
}

        private void SetupBranding()
        {
            var imageFolder = "";

if BRAND_APP1
            imageFolder = "App1";
elif BRAND_APP2
            imageFolder = "App2";
elif BRAND_APP3
            imageFolder = "App3";
elif BRAND_APP4
            imageFolder = "App4";
<h1>endif</h1>

            // Get the assembly name
            string assemblyName = Assembly.GetExecutingAssembly().GetName().Name;

            // Form the path to the assembly's image folder
            var path = $"/{assemblyName};component/Images/Brand/{imageFolder}/My_Image.png";
            MyImage = new BitmapImage(new Uri(path, UriKind.Relative));
        }

Source="/App1;component/Images/My_Image.png"

<pre lang="C#"><pre>using System;
using System.Collections.Generic;
using System.Text;

namespace Dark_Admin_Panel.Model
{
    public class Playlist
    {
        // Root myDeserializedClass = JsonConvert.DeserializeObject<Root>(myJsonResponse);
        public class AddedBy
        {
            public ExternalUrls external_urls { get; set; }
            public string href { get; set; }
            public string id { get; set; }
            public string type { get; set; }
            public string uri { get; set; }
        }

        public class Album
        {
            public string album_type { get; set; }
            public List<Artist> artists { get; set; }
            public List<string> available_markets { get; set; }
            public ExternalUrls external_urls { get; set; }
            public string href { get; set; }
            public string id { get; set; }
            public List<Image> images { get; set; }
            public string name { get; set; }
            public string release_date { get; set; }
            public string release_date_precision { get; set; }
            public int total_tracks { get; set; }
            public string type { get; set; }
            public string uri { get; set; }
        }

        public class Artist
        {
            public ExternalUrls external_urls { get; set; }
            public string href { get; set; }
            public string id { get; set; }
            public string name { get; set; }
            public string type { get; set; }
            public string uri { get; set; }
        }

        public class ExternalIds
        {
            public string isrc { get; set; }
        }

        public class ExternalUrls
        {
            public string spotify { get; set; }
        }

        public class Followers
        {
            public object href { get; set; }
            public int total { get; set; }
        }

        public class Image
        {
            public int height { get; set; }
            public string url { get; set; }
            public int width { get; set; }
        }

        public class Item
        {
            public DateTime added_at { get; set; }
            public AddedBy added_by { get; set; }
            public bool is_local { get; set; }
            public object primary_color { get; set; }
            public Track track { get; set; }
            public VideoThumbnail video_thumbnail { get; set; }
        }

        public class Owner
        {
            public string display_name { get; set; }
            public ExternalUrls external_urls { get; set; }
            public string href { get; set; }
            public string id { get; set; }
            public string type { get; set; }
            public string uri { get; set; }
        }

        public class Root
        {
            public bool collaborative { get; set; }
            public string description { get; set; }
            public ExternalUrls external_urls { get; set; }
            public Followers followers { get; set; }
            public string href { get; set; }
            public string id { get; set; }
            public List<Image> images { get; set; }
            public string name { get; set; }
            public Owner owner { get; set; }
            public object primary_color { get; set; }
            public bool @public { get; set; }
            public string snapshot_id { get; set; }
            public Tracks tracks { get; set; }
            public string type { get; set; }
            public string uri { get; set; }
        }

        public class Track
        {
            public Album album { get; set; }
            public List<Artist> artists { get; set; }
            public List<string> available_markets { get; set; }
            public int disc_number { get; set; }
            public int duration_ms { get; set; }
            public bool episode { get; set; }
            public bool @explicit { get; set; }
            public ExternalIds external_ids { get; set; }
            public ExternalUrls external_urls { get; set; }
            public string href { get; set; }
            public string id { get; set; }
            public bool is_local { get; set; }
            public string name { get; set; }
            public int popularity { get; set; }
            public string preview_url { get; set; }
            public bool track { get; set; }
            public int track_number { get; set; }
            public string type { get; set; }
            public string uri { get; set; }
        }

        public class Tracks
        {
            public string href { get; set; }
            public List<Item> items { get; set; }
            public int limit { get; set; }
            public object next { get; set; }
            public int offset { get; set; }
            public object previous { get; set; }
            public int total { get; set; }
        }

        public class VideoThumbnail
        {
            public object url { get; set; }
        }

    }
}

<pre>using System;
using System.Collections.Generic;
using System.Reflection.Metadata;
using System.Text;
using static Dark_Admin_Panel.Model.SpotifySearch;

namespace Dark_Admin_Panel.Model
{
    public class SpotifySearch
    {
        public class ExternalUrls
        {
            public string spotify { get; set; }
        }

        public class Followers
        {
            public object href { get; set; }
            public int total { get; set; }
        }

        public class ImageSP
        {
            public int width { get; set; }
            public string url { get; set; }
            public int height { get; set; }
        }

        public class Item
        {
            public ExternalUrls external_urls { get; set; }
            public Followers followers { get; set; }
            public List<string> genres { get; set; }
            public string id { get; set; }
            public List<ImageSP> images { get; set; }
            public string name { get; set; }
            public int popularity { get; set; }
            public string type { get; set; }
            public string uri { get; set; }

        }

        public class Artists
        {
            public string href { get; set; }
            public List<Item> items { get; set; }
            public int limit { get; set; }

        }


        //public class playlist
        //{
        //    public string href { get; set; }
        //    public int limit { get; set; }
        //    public List<playlistItems> items { get; set; }
        //    public int total { get; set; }
        //}


        public class PlaylistItem
        {
            public ExternalUrls external_urls { get; set; }
            public string id { get; set; }
            public string name { get; set; }
            public string type { get; set; }
            public List<ImageSP> images { get; set; }

            public Tracks tracks { get; set; }

            public string uri { get; set; }
        }



        public class PlaylistContainer
        {
            public string href { get; set; }
            public List<PlaylistItem> items { get; set; }
            public int total { get; set; }
            public int limit { get; set; }
        }



        public class Tracks
        {
          public string href { get; set; }
          
          public int total { get; set; }



        }

        public class SpotifyResult
        {
            public PlaylistContainer playlists { get; set; }
            public class AddedBy
            {
                public ExternalUrls external_urls { get; set; }
                public string href { get; set; }
                public string id { get; set; }
                public string type { get; set; }
                public string uri { get; set; }
            }

            public class Album
            {
                public string album_type { get; set; }
                public List<Artist> artists { get; set; }
                public List<string> available_markets { get; set; }
                public ExternalUrls external_urls { get; set; }
                public string href { get; set; }
                public string id { get; set; }
                public List<Image> images { get; set; }
                public string name { get; set; }
                public string release_date { get; set; }
                public string release_date_precision { get; set; }
                public int total_tracks { get; set; }
                public string type { get; set; }
                public string uri { get; set; }
            }

            public class Artist
            {
                public ExternalUrls external_urls { get; set; }
                public string href { get; set; }
                public string id { get; set; }
                public string name { get; set; }
                public string type { get; set; }
                public string uri { get; set; }
            }

            public class ExternalIds
            {
                public string isrc { get; set; }
            }

            public class ExternalUrls
            {
                public string spotify { get; set; }
            }

            public class Followers
            {
                public object href { get; set; }
                public int total { get; set; }
            }

            public class Image
            {
                public int height { get; set; }
                public string url { get; set; }
                public int width { get; set; }
            }

            public class Item
            {
                public DateTime added_at { get; set; }
                public AddedBy added_by { get; set; }
                public bool is_local { get; set; }
                public object primary_color { get; set; }
                public Track track { get; set; }
                public VideoThumbnail video_thumbnail { get; set; }
            }

            public class Owner
            {
                public string display_name { get; set; }
                public ExternalUrls external_urls { get; set; }
                public string href { get; set; }
                public string id { get; set; }
                public string type { get; set; }
                public string uri { get; set; }
            }

            public class Root
            {
                public bool collaborative { get; set; }
                public string description { get; set; }
                public ExternalUrls external_urls { get; set; }
                public Followers followers { get; set; }
                public string href { get; set; }
                public string id { get; set; }
                public List<Image> images { get; set; }
                public string name { get; set; }
                public Owner owner { get; set; }
                public object primary_color { get; set; }
                public bool @public { get; set; }
                public string snapshot_id { get; set; }
                public Tracks tracks { get; set; }
                public string type { get; set; }
                public string uri { get; set; }
            }

            public class Track
            {
                public Album album { get; set; }
                public List<Artist> artists { get; set; }
                public List<string> available_markets { get; set; }
                public int disc_number { get; set; }
                public int duration_ms { get; set; }
                public bool episode { get; set; }
                public bool @explicit { get; set; }
                public ExternalIds external_ids { get; set; }
                public ExternalUrls external_urls { get; set; }
                public string href { get; set; }
                public string id { get; set; }
                public bool is_local { get; set; }
                public string name { get; set; }
                public int popularity { get; set; }
                public string preview_url { get; set; }
                public bool track { get; set; }
                public int track_number { get; set; }
                public string type { get; set; }
                public string uri { get; set; }
            }

            public class Tracks
            {
                public string href { get; set; }
                public List<Item> items { get; set; }
                public int limit { get; set; }
                public object next { get; set; }
                public int offset { get; set; }
                public object previous { get; set; }
                public int total { get; set; }
            }

            public class VideoThumbnail
            {
                public object url { get; set; }
            }

            public class SpotifySearch
            {
                public class ExternalUrls
                {
                    public string spotify { get; set; }
                }

                public class Followers
                {
                    public object href { get; set; }
                    public int total { get; set; }
                }

                public class ImageSP
                {
                    public int width { get; set; }
                    public string url { get; set; }
                    public int height { get; set; }
                }

                public class Item
                {
                    public ExternalUrls external_urls { get; set; }
                    public Followers followers { get; set; }
                    public List<string> genres { get; set; }
                    public string id { get; set; }
                    public List<ImageSP> images { get; set; }
                    public string name { get; set; }
                    public int popularity { get; set; }
                    public string type { get; set; }
                    public string uri { get; set; }

                }

                public class Artists
                {
                    public string href { get; set; }
                    public List<Item> items { get; set; }
                    public int limit { get; set; }

                }

                public class PlaylistItem
                {
                    public ExternalUrls external_urls { get; set; }
                    public string id { get; set; }
                    public string name { get; set; }
                    public string type { get; set; }
                    public List<ImageSP> images { get; set; }

                    public Tracks tracks { get; set; }

                    public string uri { get; set; }
                }

                public class PlaylistContainer
                {
                    public string href { get; set; }
                    public List<PlaylistItem> items { get; set; }
                    public int total { get; set; }
                    public int limit { get; set; }
                }

                public class Tracks
                {
                    public string href { get; set; }
                    public int total { get; set; }
                }

                public class SpotifyResult
                {
                    public PlaylistContainer playlists { get; set; }
                }
            }
        }

    }
}

<pre>public static SpotifySearch.SpotifyResult SearchArtistOrSong(string searchword)
        {
            var client = new RestClient("https://api.spotify.com/v1/playlists");
            client.AddDefaultHeader("Authorization", $"Bearer {token.access_token}");
            var request = new RestRequest($"{searchword}", Method.Get); // Corrected here
            var response = client.Execute(request);

            if (response.IsSuccessful)
            {
                var result = JsonConvert.DeserializeObject<SpotifySearch.SpotifyResult>(response.Content);
                return result;
            }
            else
            {
                return null;
            }
        }

<pre> private void elfentext_KeyUp(object sender, KeyEventArgs e)
        {

            var result = SearchHelper.SearchArtistOrSong(elfentext.Text);
            if (result == null)
            {
                return;
            }

            var listArtist = new List<SpotifySearch.PlaylistItem>();

            if (result?.playlists?.items != null)
            {
                foreach (var item in result.playlists.items)
                {
                    var images = item.images.Any() ? item.images : new List<SpotifySearch.ImageSP>();
                    listArtist.Add(new SpotifySearch.PlaylistItem()
                    {
                        external_urls = item.external_urls,
                        id = item.id,
                        name = item.name,
                        type = item.type,
                        images = images,
                        tracks = item.tracks,
                        uri = item.uri
                    });
                }
            }

            elfenlist.ItemsSource = listArtist;
        }

// Stores the value of the DP IsPaneExpanded during initialization. See
// comments in the DP IsPaneExpanded 
private bool _isPaneExpanded = false;

// Set to true after the control has finished initializing
private bool _isInitialized = false;

public static readonly DependencyProperty IsPaneExpandedProperty =
            DependencyProperty.Register("IsPaneExpanded",
            typeof(bool),
            typeof(NavigationPane),
            new PropertyMetadata(false, new PropertyChangedCallback(OnIsPaneExpandedChanged)));

public bool IsPaneExpanded
{
    get { return (bool)GetValue(IsPaneExpandedProperty); }
    set { SetValue(IsPaneExpandedProperty, value); }
}

private static async void OnIsPaneExpandedChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
    var control = (NavigationPane)d;

    if (!control._isInitialized)
    {
        // If here, the control is still being initialized. Store the
        // IsPaneExpanded setting for later use when the control's init
        // has finished
        control._isPaneExpanded = control.IsPaneExpanded;

        // Since the control is not loaded, there is nothing to show. But
        // since the IsExpanded can be set from the Window, and it's bound,
        // it's possible for the expander arrow to show open even though
        // there's nothing there. So force the expander to show as collapsed
        control.IsPaneExpanded = false;
    }
    else
    {
        // If here, the control has already been initialized, so go ahead
        // and call load. If here, the user clicked the expander arrow.
        if (control.IsPaneExpanded)
        {
            await control.Load();
        }
    }
}

private async void NavigationPane_Initialized(object? sender, EventArgs e)
{
    // If the control's IsPaneExpanded was set from the parent, then
    // the IsPandedExpanded DP would have set _isPaneExpanded = true.
    if (_isPaneExpanded) <==================================================== PROBLEM 1 HERE
    {
        // Now that the control has finished initializing, go ahead
        // and call load

        <=============================== PROBLEM 2 HERE. HOW DO YOU FORCE THE EXPANDER TO SHOW AS OPEN BEFORE LOAD
        await Load();
    }

    _isInitialized = true;
}