Putting in a sample for working around Dragablz using an old brush name (#2368)

Author: Keboo

MahMaterialDragablzMashUp/App.xaml

@@ -31,6 +31,7 @@
                 <ResourceDictionary Source="pack://application:,,,/ShowMeTheXAML.AvalonEdit;component/Themes/xamldisplayer.xaml" />
 
             </ResourceDictionary.MergedDictionaries>
+
             <!-- MahApps Brushes -->
             <!--<SolidColorBrush x:Key="HighlightBrush" Color="{DynamicResource Primary700}"/>
             <SolidColorBrush x:Key="AccentColorBrush" Color="{DynamicResource Primary500}"/>

MahMaterialDragablzMashUp/App.xaml.cs

@@ -4,6 +4,7 @@
 using System.Windows;
 using MaterialDesignColors;
 using ShowMeTheXAML;
+using System.Windows.Media;
 
 namespace MahMaterialDragablzMashUp
 {
@@ -16,6 +17,19 @@ protected override void OnStartup(StartupEventArgs e)
         {
             XamlDisplay.Init();
             base.OnStartup(e);
+
+            //Add/Update brush used by Dragablz when the theme changes
+            //Solution for https://github.com/MaterialDesignInXAML/MaterialDesignInXamlToolkit/issues/2349
+            PaletteHelper helper = new PaletteHelper();
+            if (helper.GetThemeManager() is { } themeManager)
+            {
+                themeManager.ThemeChanged += ThemeManager_ThemeChanged;
+            }
+        }
+
+        private void ThemeManager_ThemeChanged(object? sender, ThemeChangedEventArgs e)
+        {
+            Resources["SecondaryAccentBrush"] = new SolidColorBrush(e.NewTheme.SecondaryMid.Color);
         }
     }
 }