AppTheming and XAML

ShellDemo/Pages/DetailPage.xaml.cs

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+// DetailPage - Demonstrates push/pop navigation
+
+using Microsoft.Maui.Controls;
+using Microsoft.Maui.Platform.Linux.Hosting;
+
+namespace ShellDemo;
+
+/// <summary>
+/// A detail page that can be pushed onto the navigation stack.
+/// </summary>
+public partial class DetailPage : ContentPage
+{
+    private readonly string _itemName;
+
+    public DetailPage() : this("Detail Item")
+    {
+    }
+
+    public DetailPage(string itemName)
+    {
+        _itemName = itemName;
+        InitializeComponent();
+        ItemNameLabel.Text = $"You navigated to: {_itemName}";
+    }
+
+    private void OnBackClicked(object? sender, EventArgs e)
+    {
+        Console.WriteLine("[DetailPage] Go Back clicked");
+        var success = LinuxViewRenderer.PopPage();
+        Console.WriteLine($"[DetailPage] PopPage result: {success}");
+    }
+}
+
+/// <summary>
+/// Query property for passing data to DetailPage.
+/// </summary>
+[QueryProperty(nameof(ItemName), "item")]
+public class DetailPageWithQuery : DetailPage
+{
+    private string _itemName = "Item";
+
+    public string ItemName
+    {
+        get => _itemName;
+        set
+        {
+            _itemName = value;
+            Title = $"Detail: {value}";
+        }
+    }
+
+    public DetailPageWithQuery() : base()
+    {
+    }
+}