Index: src/Views/LearningUnitListItem.xaml
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
diff --git a/src/Views/LearningUnitListItem.xaml b/src/Views/LearningUnitListItem.xaml
--- a/src/Views/LearningUnitListItem.xaml	(revision 0861b95f06aae43a83852872dacba2ed5f743d08)
+++ b/src/Views/LearningUnitListItem.xaml	(revision f1714ff74973c30896da5c74b3e51f685591ae00)
@@ -48,27 +48,30 @@
 
         <Button Background="Transparent"
             ImageSource="{FontImage Glyph={x:Static f:FontAwesome.ChevronDown}, Color=#C9C8CA, FontFamily=FontAwesome, Size=32}"
-            Clicked="OnChapters_Clicked"
+            Command="{Binding ToggleLessonsCommand}"
             HorizontalOptions="Center"/>
 
         <VerticalStackLayout
             x:Name="ChaptersLayout"
-            IsVisible="False" 
+            IsVisible="{Binding IsShowingLessons}" 
             Spacing="8"
             HorizontalOptions="Fill"
             BindableLayout.ItemsSource="{Binding Chapters}">
             <BindableLayout.ItemTemplate>
                 <DataTemplate x:DataType="m:Chapter">
-                    <VerticalStackLayout Spacing="8" HorizontalOptions="Fill">
+                    <VerticalStackLayout Spacing="8"
+                                         HorizontalOptions="Fill">
                         <Label Text="{Binding Title}"
                             TextColor="{AppThemeBinding Light=#383638,Dark=#C9C8CA}"
                             FontSize="16"
                             FontAttributes="Bold"/>
-                        <VerticalStackLayout Spacing="8" HorizontalOptions="Fill"
-                            BindableLayout.ItemsSource="{Binding Lessons}">
+                        <VerticalStackLayout Spacing="8"
+                                             HorizontalOptions="Fill"
+                                             BindableLayout.ItemsSource="{Binding Lessons}">
                             <BindableLayout.ItemTemplate>
                                 <DataTemplate x:DataType="m:Lesson">
-                                    <Grid ColumnDefinitions="Auto,*" 
+                                    <Grid
+                                        ColumnDefinitions="Auto,*" 
                                         ColumnSpacing="12"
                                         HorizontalOptions="Fill">
                                         <Border Background="{AppThemeBinding Light=#D8D7D9,Dark=#383638}"
Index: src/Services/MockDataService.cs
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
diff --git a/src/Services/MockDataService.cs b/src/Services/MockDataService.cs
--- a/src/Services/MockDataService.cs	(revision 0861b95f06aae43a83852872dacba2ed5f743d08)
+++ b/src/Services/MockDataService.cs	(revision f1714ff74973c30896da5c74b3e51f685591ae00)
@@ -169,9 +169,9 @@
         "Greeting for the First Time",
         "Starting an Introduction",
         "Talking about the Weather",
-        "Talking about the Your Nationality",
-        "Talking about Your Age",
-        "Test"
+        // "Talking about the Your Nationality",
+        // "Talking about Your Age",
+        // "Test"
     };
 
     public static string[] lessonTitles = new string[]{
@@ -180,10 +180,10 @@
         "Where are you from?",
         "How old are you?",
         "What do you do?",
-        "What is your phone number?",
-        "What is your email address?",
-        "What is your address?",
-        "What are you doing?"
+        // "What is your phone number?",
+        // "What is your email address?",
+        // "What is your address?",
+        // "What are you doing?"
     };  
 
     public static string[] icons = new string[]{
@@ -203,17 +203,18 @@
         if (_units != null)
             return _units;
 
-        int count = 4;
+        int count = 50;
         _units = new List<Unit>();
         for (int i = 0; i < count; i++)
         {
             _units.Add(new Unit
             {
                 UnitNumber = i,
-                Title = unitTitles[i],
+                Title = unitTitles[i % unitTitles.Length],
                 SubTitle = $"Sub Title {i}",
+                IsShowingLessons = i % 2 == 0,
                 Icon = $"{icons[Random.Shared.Next(0, icons.Length - 1)]}",
-                Chapters = GenerateChapters(Random.Shared.Next(1, chapterTitles.Length))
+                Chapters = GenerateChapters(chapterTitles.Length)
             });
         }
         return _units;
@@ -227,7 +228,7 @@
             chapters.Add(new Chapter
             {
                 Title = chapterTitles[i],
-                Lessons = GenerateLessons(Random.Shared.Next(1, lessonTitles.Length))
+                Lessons = GenerateLessons(lessonTitles.Length)
             });
         }
         return chapters;
Index: src/Pages/LearningPage.xaml
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
diff --git a/src/Pages/LearningPage.xaml b/src/Pages/LearningPage.xaml
--- a/src/Pages/LearningPage.xaml	(revision 0861b95f06aae43a83852872dacba2ed5f743d08)
+++ b/src/Pages/LearningPage.xaml	(revision f1714ff74973c30896da5c74b3e51f685591ae00)
@@ -3,6 +3,7 @@
              xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
              xmlns:vm="clr-namespace:AllTheLists.ViewModels"
              xmlns:v="clr-namespace:AllTheLists.Views"
+             xmlns:learning="clr-namespace:AllTheLists.Models.Learning"
              x:DataType="vm:LearningUnitsViewModel"
              x:Class="AllTheLists.Pages.LearningPage"
              Title="LearningPage">
@@ -26,7 +27,7 @@
                 ItemSpacing="10" />
             </CollectionView.ItemsLayout>
         <CollectionView.ItemTemplate>
-            <DataTemplate>
+            <DataTemplate x:DataType="learning:Unit">
                 <v:LearningUnitListItem />
             </DataTemplate>
         </CollectionView.ItemTemplate>
Index: src/Models/Learning/Unit.cs
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
diff --git a/src/Models/Learning/Unit.cs b/src/Models/Learning/Unit.cs
--- a/src/Models/Learning/Unit.cs	(revision 0861b95f06aae43a83852872dacba2ed5f743d08)
+++ b/src/Models/Learning/Unit.cs	(revision f1714ff74973c30896da5c74b3e51f685591ae00)
@@ -1,4 +1,5 @@
 using CommunityToolkit.Mvvm.ComponentModel;
+using CommunityToolkit.Mvvm.Input;
 
 namespace AllTheLists.Models.Learning;
 
@@ -21,5 +22,10 @@
 
     [ObservableProperty]
     private bool _isShowingLessons;
-
+    
+    [RelayCommand]
+    public void ToggleLessons()
+    {
+        IsShowingLessons = !IsShowingLessons;
+    }
 }