Update

Controls/MetroListBox.cs

@@ -1,58 +1,83 @@
 using Jamesnet.Wpf.Animation;
 using Jamesnet.Wpf.Controls;
+using MaterialDesignColors;
 using MaterialDesignColors.ColorManipulation;
 using System;
 using System.Collections.Generic;
 using System.Drawing;
 using System.Linq;
+using System.Reflection;
 using System.Text;
 using System.Threading.Tasks;
 using System.Windows;
 using System.Windows.Controls;
 using System.Windows.Media;
 using System.Windows.Media.Animation;
 using System.Windows.Shapes;
+using ThemeChange_WPF;
 using Rectangle = System.Windows.Shapes.Rectangle;
 namespace CustomWindow_WPF.Controls
 {
     internal class MetroListBox : ListBox
     {
-        private ValueItem? valueItem;
-        private Storyboard? storyboard;
-        private Rectangle? _rectangle;
+        private ValueItem valueItemX;
+        private ValueItem valueItemY;
+        private Storyboard storyboard;
         public override void OnApplyTemplate()
         {
-            Grid grid = (Grid)GetTemplateChild("MetroGrid");
             base.OnApplyTemplate();
-            InitStoryboard(grid);
+
+            Viewbox viewbox = (Viewbox)GetTemplateChild("PART_MetroViewBox");
+
+            InitStoryboard(viewbox);
+
+
         }
         static MetroListBox()
         {
             DefaultStyleKeyProperty.OverrideMetadata(typeof(MetroListBox), new FrameworkPropertyMetadata(typeof(MetroListBox)));
         }
 
-        private void InitStoryboard(Grid grid)
+
+        private void InitStoryboard(Viewbox viewbox)
         {
-            valueItem = new();
+
+            viewbox.RenderTransform=new TranslateTransform(-80,0);
+            DependencyProperty[] propertyChainX = new DependencyProperty[]
+            {
+                Canvas.RenderTransformProperty,
+                TranslateTransform.XProperty,
+            };
+            DependencyProperty[] propertyChainY = new DependencyProperty[]
+                {
+                Canvas.RenderTransformProperty,
+                TranslateTransform.YProperty,
+
+                };
             storyboard = new();
+            valueItemX= new();
+            valueItemY= new();
+            CreateAnimationFor(storyboard,valueItemX, viewbox, propertyChainX);
+
+
+        }
 
+
+        private void CreateAnimationFor(Storyboard storyboard,ValueItem valueItem,Viewbox viewbox, DependencyProperty[] propertyPath)
+        {
             valueItem.Mode = EasingFunctionBaseMode.QuinticEaseInOut;
-            valueItem.Property = new PropertyPath(Canvas.LeftProperty);
+            valueItem.Property = new PropertyPath("(0).(1)", propertyPath);
             valueItem.Duration = new Duration(new TimeSpan(0, 0, 0, 0, 500));
 
-            Storyboard.SetTarget(valueItem, grid);
-            Storyboard.SetTargetProperty(valueItem,valueItem.Property);
-
+            Storyboard.SetTarget(valueItem, viewbox);
+            Storyboard.SetTargetProperty(valueItem, valueItem.Property);
             storyboard.Children.Add(valueItem);
         }
-
         protected override void OnSelectionChanged(SelectionChangedEventArgs e)
         {
-            valueItem = new();
-            storyboard = new();
+
             base.OnSelectionChanged(e);
-
-            valueItem.To = SelectedIndex * 50;
+            valueItemX.To = SelectedIndex * 80;
             storyboard.Begin();
         }
     }

DependencyPropertyChain.cs

@@ -0,0 +1,16 @@
+using System;
+using System.Collections.Generic;
+using System.Linq;
+using System.Text;
+using System.Threading.Tasks;
+using System.Windows.Controls;
+using System.Windows.Media;
+using System.Windows;
+
+namespace ThemeChange_WPF
+{
+    internal class DependencyPropertyChain
+    {
+
+    }
+}

MainWindow.xaml

@@ -13,7 +13,7 @@ VerticalAlignment="Center">
     HorizontalAlignment="Center"
     VerticalAlignment="Center"
     ItemContainerStyle="{StaticResource MetroItem}"
-    Style="{StaticResource MaterialDesignListBox}">
+    Style="{StaticResource MetroListBox}">
             <controls:MetroListBox.ItemsPanel>
                 <ItemsPanelTemplate>
                     <UniformGrid Columns="4" Rows="4" />
@@ -39,5 +39,6 @@ VerticalAlignment="Center">
             <controls:MetroListBoxItem Background="#000000" />
 
         </controls:MetroListBox>
-    </StackPanel>
+
+    </StackPanel>                 
 </Window>

MainWindow.xaml.cs

@@ -19,6 +19,9 @@ public partial class MainWindow : Window
         public MainWindow()
         {
             InitializeComponent();
+
         }
+
+
     }
 }