Fixed: The propagation issue of OverlayFeedbackElement.ClosedEvent.

demo/Sandbox/Views/PW.axaml

@@ -0,0 +1,15 @@
+<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="Sandbox.Views.PW">
+    <Panel>
+        <Button Content="???" Click="Button_OnClick"></Button>
+        <Button Content="close" VerticalAlignment="Bottom" Click="Close"></Button>
+        <u:OverlayDialogHost x:Name="_overlayDialogHost" ></u:OverlayDialogHost>
+    </Panel>
+</UserControl>