Add:OverlayFeedbackElement.ClosedEvent fixed HeadlessTest.

tests/HeadlessTest.Ursa/Controls/DrawerTests/CloseEventTest/DrawerCloseTestPopupControl.axaml

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+<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"
+             xmlns:u="https://irihi.tech/ursa"
+             MinHeight="200"
+             MinWidth="500"
+             mc:Ignorable="d" d:DesignWidth="800" d:DesignHeight="450"
+             x:Class="HeadlessTest.Ursa.Controls.DrawerCloseTestPopupControl">
+    <u:OverlayDialogHost x:Name="_overlayDialogHost" ></u:OverlayDialogHost>
+</UserControl>

tests/HeadlessTest.Ursa/Controls/DrawerTests/CloseEventTest/DrawerCloseTestPopupControl.axaml.cs

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+using System;
+using System.ComponentModel;
+using System.IO;
+using System.Runtime.CompilerServices;
+using Avalonia;
+using Avalonia.Controls;
+using Avalonia.Interactivity;
+using Avalonia.Markup.Xaml;
+using Ursa.Controls;
+
+namespace HeadlessTest.Ursa.Controls;
+
+public partial class DrawerCloseTestPopupControl : UserControl
+{
+    public DrawerCloseTestPopupControl()
+    {
+        InitializeComponent();
+        _overlayDialogHost.HostId = _hostid;
+    }
+
+    private readonly string _hostid = Path.GetRandomFileName();
+    public DrawerCloseTestPopupControl Popup { get; set; }
+    public int LResult { get; set; }
+    public int RResult { get; set; }
+
+    public async void OpenPopup()
+    {
+        var vm = new DrawerCloseTestPopupControlVM();
+        LResult = vm.Result;
+        RResult = await Drawer.ShowCustomModal<int>(Popup = new(), vm, _hostid);
+    }
+
+    public void ClosePopup()
+    {
+        (Popup.DataContext as DrawerCloseTestPopupControlVM)?.Close();
+    }
+
+
+    public void Close()
+    {
+        (DataContext as DrawerCloseTestPopupControlVM)?.Close();
+    }
+}

tests/HeadlessTest.Ursa/Controls/DrawerTests/CloseEventTest/DrawerCloseTestPopupControlVM.cs

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+using Irihi.Avalonia.Shared.Contracts;
+
+namespace HeadlessTest.Ursa.Controls;
+
+public class DrawerCloseTestPopupControlVM : IDialogContext
+{
+    public void Close()
+    {
+        RequestClose?.Invoke(this, Result);
+    }
+
+    public int Result { get; } = Random.Shared.Next();
+
+    public event EventHandler<object?>? RequestClose;
+}