diff --git a/.gitignore b/.gitignore
index f5786b4683..a599a267d4 100644
--- a/.gitignore
+++ b/.gitignore
@@ -156,3 +156,4 @@ $RECYCLE.BIN/
## Monodevelop
#################
*.userprefs
+*.nugetreferenceswitcher
diff --git a/Perspex.Controls/ItemsControl.cs b/Perspex.Controls/ItemsControl.cs
index 4dab49dd98..18b60add05 100644
--- a/Perspex.Controls/ItemsControl.cs
+++ b/Perspex.Controls/ItemsControl.cs
@@ -8,6 +8,7 @@ namespace Perspex.Controls
{
using System;
using System.Collections;
+ using System.Collections.ObjectModel;
using System.Collections.Specialized;
using System.Diagnostics.CodeAnalysis;
using System.Linq;
@@ -35,7 +36,7 @@ namespace Perspex.Controls
/// Defines the property.
///
public static readonly PerspexProperty ItemsProperty =
- PerspexProperty.Register("Items");
+ PerspexProperty.Register("Items", defaultValue: new Collection