Use UIHelper.AnnounceActionForAccessibility for narrator announcements without visible TextBlock

Co-authored-by: ayushjai19 <244442986+ayushjai19@users.noreply.github.com>

Author: Copilot

WinUIGallery/Samples/ControlPages/PipsPagerPage.xaml

@@ -51,19 +51,10 @@
         </controls:ControlExample>
         <controls:ControlExample x:Name="Example2" HeaderText="PipsPager with options to change its orientation and button visibility.">
             <controls:ControlExample.Example>
-                <StackPanel>
-                    <PipsPager
-                        x:Name="TestPipsPager2"
-                        NumberOfPages="10"
-                        SelectedIndexChanged="TestPipsPager2_SelectedIndexChanged" />
-                    <TextBlock
-                        x:Name="PageAnnouncementText"
-                        Margin="0,12,0,0"
-                        HorizontalAlignment="Center"
-                        AutomationProperties.LiveSetting="Polite"
-                        AutomationProperties.Name="Current page"
-                        Text="Page 1 selected" />
-                </StackPanel>
+                <PipsPager
+                    x:Name="TestPipsPager2"
+                    NumberOfPages="10"
+                    SelectedIndexChanged="TestPipsPager2_SelectedIndexChanged" />
             </controls:ControlExample.Example>
             <controls:ControlExample.Options>
                 <StackPanel>

WinUIGallery/Samples/ControlPages/PipsPagerPage.xaml.cs

@@ -3,6 +3,7 @@
 
 using Microsoft.UI.Xaml.Controls;
 using System.Collections.Generic;
+using WinUIGallery.Helpers;
 
 namespace WinUIGallery.ControlPages;
 
@@ -26,11 +27,9 @@ public PipsPagerPage()
 
     private void TestPipsPager2_SelectedIndexChanged(PipsPager sender, PipsPagerSelectedIndexChangedEventArgs args)
     {
-        if (PageAnnouncementText != null)
-        {
-            int pageNumber = sender.SelectedPageIndex + 1; // Convert 0-based index to 1-based page number
-            PageAnnouncementText.Text = $"Page {pageNumber} selected";
-        }
+        int pageNumber = sender.SelectedPageIndex + 1; // Convert 0-based index to 1-based page number
+        string announcement = $"Page {pageNumber} selected";
+        UIHelper.AnnounceActionForAccessibility(sender, announcement, "PipsPagerPageChangeNotificationId");
     }
 
     private void OrientationComboBox_SelectionChanged(object sender, SelectionChangedEventArgs e)