diff --git a/Fluent.Ribbon.Showcase/TestContent.xaml b/Fluent.Ribbon.Showcase/TestContent.xaml
index 604487d15..97f773cd8 100644
--- a/Fluent.Ribbon.Showcase/TestContent.xaml
+++ b/Fluent.Ribbon.Showcase/TestContent.xaml
@@ -503,7 +503,7 @@
                                        x:Name="groupLL">
                     <Fluent:ComboBox IsEditable="False"
                                      InputWidth="150"
-                                     Header="Test"
+                                     Header="Fonts"
                                      ItemsSource="{Binding FontsViewModel.FontsData}"
                                      KeyTip="FD">
                         <Fluent:ComboBox.ItemTemplate>
@@ -513,9 +513,10 @@
                             </DataTemplate>
                         </Fluent:ComboBox.ItemTemplate>
                     </Fluent:ComboBox>
+
                     <Fluent:ComboBox IsEditable="False"
                                      InputWidth="150"
-                                     Header="Test"
+                                     Header="Fonts"
                                      ItemsSource="{Binding FontsViewModel.FontsData}">
                         <Fluent:ComboBox.ItemTemplate>
                             <DataTemplate>
@@ -525,6 +526,9 @@
                         </Fluent:ComboBox.ItemTemplate>
                     </Fluent:ComboBox>
 
+                    <Fluent:Button Header="Add item to fonts"
+                                   Click="HandleAddItemToFontsClick" />
+
                     <Fluent:ComboBox Name="FilterComboBox"
                                      IsReadOnly="True"
                                      KeyTip="H"
diff --git a/Fluent.Ribbon.Showcase/TestContent.xaml.cs b/Fluent.Ribbon.Showcase/TestContent.xaml.cs
index 9e93c000a..ebd69b48c 100644
--- a/Fluent.Ribbon.Showcase/TestContent.xaml.cs
+++ b/Fluent.Ribbon.Showcase/TestContent.xaml.cs
@@ -57,10 +57,10 @@ private void OnLauncherButtonClick(object sender, RoutedEventArgs e)
             var groupBox = (RibbonGroupBox)sender;
 
             var wnd = new Window
-                {
-                    Content = string.Format("Launcher-Window for: {0}", groupBox.Header),
-                    Owner = Window.GetWindow(this)
-                };
+            {
+                Content = string.Format("Launcher-Window for: {0}", groupBox.Header),
+                Owner = Window.GetWindow(this)
+            };
 
             wnd.Show();
         }
@@ -338,9 +338,9 @@ private void OnSpinnerValueChanged(object sender, RoutedPropertyChangedEventArgs
         private void OnMenuItemClick(object sender, RoutedEventArgs e)
         {
             var wnd = new TestWindow
-                      {
-                          Owner = Window.GetWindow(this)
-                      };
+            {
+                Owner = Window.GetWindow(this)
+            };
             wnd.Show();
         }
 
@@ -427,6 +427,11 @@ private void ShowStartScreen_OnClick(object sender, RoutedEventArgs e)
             this.startScreen.Shown = false;
             this.startScreen.IsOpen = true;
         }
+
+        private void HandleAddItemToFontsClick(object sender, RoutedEventArgs e)
+        {
+            this.viewModel.FontsViewModel.FontsData.Add($"Added item {this.viewModel.FontsViewModel.FontsData.Count}");
+        }
     }
 
     public class TestRoutedCommand
diff --git a/Fluent.Ribbon.Showcase/ViewModels/FontsViewModel.cs b/Fluent.Ribbon.Showcase/ViewModels/FontsViewModel.cs
index c70e00180..106faea3d 100644
--- a/Fluent.Ribbon.Showcase/ViewModels/FontsViewModel.cs
+++ b/Fluent.Ribbon.Showcase/ViewModels/FontsViewModel.cs
@@ -1,10 +1,12 @@
-namespace FluentTest.ViewModels
+using System.Collections.ObjectModel;
+
+namespace FluentTest.ViewModels
 {
     public class FontsViewModel : ViewModel
     {
-        private readonly string[] data = { "Tahoma", "Segoe UI", "Arial", "Courier New", "Symbol" };
+        private readonly ObservableCollection<string> data = new ObservableCollection<string> { "Tahoma", "Segoe UI", "Arial", "Courier New", "Symbol" };
 
-        public string[] FontsData
+        public ObservableCollection<string> FontsData
         {
             get { return this.data; }
         }