diff --git a/Sample Applications/ExpenseIt/ExpenseItDemo/CreateExpenseReportDialogBox.cs b/Sample Applications/ExpenseIt/ExpenseItDemo/CreateExpenseReportDialogBox.cs
index b728084fc..21dcff8f8 100644
--- a/Sample Applications/ExpenseIt/ExpenseItDemo/CreateExpenseReportDialogBox.cs	
+++ b/Sample Applications/ExpenseIt/ExpenseItDemo/CreateExpenseReportDialogBox.cs	
@@ -26,7 +26,7 @@ private void addExpenseButton_Click(object sender, RoutedEventArgs e)
             var app = Application.Current;
             var expenseReport = (ExpenseReport) app.FindResource("ExpenseData");
             expenseReport?.LineItems.Add(new LineItem());
-            
+
             DataGridRow row =null;
 
             // Dispatching this at loaded priority so the new row has been added before our code runs
@@ -82,15 +82,37 @@ private void viewChartButton_Click(object sender, RoutedEventArgs e)
             dlg.Show();
         }
 
+        bool isValid(DependencyObject parent)
+        {
+            if (System.Windows.Controls.Validation.GetHasError(parent)) return false;
+
+            for(int i = 0; i != VisualTreeHelper.GetChildrenCount(parent); i++)
+            {
+                DependencyObject child = VisualTreeHelper.GetChild(parent, i);
+                if (!isValid(child)) return false;
+            }
+
+            return true;
+        }
+
         private void okButton_Click(object sender, RoutedEventArgs e)
         {
-            MessageBox.Show(
-                "Expense Report Created!",
-                "ExpenseIt Standalone",
-                MessageBoxButton.OK,
-                MessageBoxImage.Information);
+            if(!isValid(expenseDataGrid1)){
+                MessageBox.Show(
+                    "Please, fix the errors.",
+                    "Error",
+                    MessageBoxButton.OK,
+                    MessageBoxImage.Error);
+            } else
+            {
+                MessageBox.Show(
+                    "Expense Report Created!",
+                    "ExpenseIt Standalone",
+                    MessageBoxButton.OK,
+                    MessageBoxImage.Information);
 
-            DialogResult = true;
+                DialogResult = true;
+            }
         }
 
         private void cancelButton_Click(object sender, RoutedEventArgs e)
diff --git a/Sample Applications/ExpenseIt/ExpenseItDemo/LineItemCollection.cs b/Sample Applications/ExpenseIt/ExpenseItDemo/LineItemCollection.cs
index 3729a3078..ac2552b95 100644
--- a/Sample Applications/ExpenseIt/ExpenseItDemo/LineItemCollection.cs	
+++ b/Sample Applications/ExpenseIt/ExpenseItDemo/LineItemCollection.cs	
@@ -2,7 +2,9 @@
 // // Licensed under the MIT license. See LICENSE file in the project root for full license information.
 
 using System;
+using System.Collections.Generic;
 using System.Collections.ObjectModel;
+using System.Collections.Specialized;
 using System.ComponentModel;
 
 namespace ExpenseItDemo
@@ -11,13 +13,9 @@ public class LineItemCollection : ObservableCollection<LineItem>
     {
         public event EventHandler LineItemCostChanged;
 
-        public new void Add(LineItem item)
+        public LineItemCollection()
         {
-            if (item != null)
-            {
-                item.PropertyChanged += LineItemPropertyChanged;
-            }
-            base.Add(item);
+            CollectionChanged += OnListItemsChanged;
         }
 
         private void LineItemPropertyChanged(object sender, PropertyChangedEventArgs e)
@@ -28,6 +26,18 @@ private void LineItemPropertyChanged(object sender, PropertyChangedEventArgs e)
             }
         }
 
+        private void OnListItemsChanged(object sender, NotifyCollectionChangedEventArgs e)
+        {
+            if(e.Action == NotifyCollectionChangedAction.Add)
+            {
+                for(int i = 0; i < e.NewItems.Count; i++)
+                {
+                    LineItem item = e.NewItems[i] as LineItem;
+                    item.PropertyChanged += LineItemPropertyChanged;
+                }
+            }
+        }
+
         private void OnLineItemCostChanged(object sender, EventArgs args)
         {
             LineItemCostChanged?.Invoke(sender, args);
diff --git a/Sample Applications/ExpenseIt/ExpenseItDemo/Styles.xaml b/Sample Applications/ExpenseIt/ExpenseItDemo/Styles.xaml
index 9bf08438d..428f20579 100644
--- a/Sample Applications/ExpenseIt/ExpenseItDemo/Styles.xaml	
+++ b/Sample Applications/ExpenseIt/ExpenseItDemo/Styles.xaml	
@@ -392,6 +392,7 @@
         <Setter Property="FontFamily" Value="Ariel" />
         <Setter Property="TextAlignment" Value="Center" />
         <Setter Property="TextTrimming" Value="WordEllipsis" />
+        <Setter Property="TextWrapping" Value="WrapWithOverflow" />
         <Setter Property="Width" Value="100" />
         <Style.Triggers>
             <DataTrigger Binding="{Binding Path=(SystemParameters.HighContrast)}" Value="true">
diff --git a/Sample Applications/ExpenseIt/ExpenseItDemo/ViewChartWindow.xaml b/Sample Applications/ExpenseIt/ExpenseItDemo/ViewChartWindow.xaml
index d798a4005..8e48dd4b2 100644
--- a/Sample Applications/ExpenseIt/ExpenseItDemo/ViewChartWindow.xaml	
+++ b/Sample Applications/ExpenseIt/ExpenseItDemo/ViewChartWindow.xaml	
@@ -4,6 +4,7 @@
         xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
         xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
         xmlns:local="clr-namespace:ExpenseItDemo"
+        DataContext="{StaticResource ExpenseData}"
         mc:Ignorable="d"
         Title="ViewChartWindow" Height="300" Width="300">
     <Grid Style="{StaticResource WindowContentGrid}">