From 813ff6fcea388b8081511afa53aaecd39f5e5239 Mon Sep 17 00:00:00 2001
From: Steven Kirk <grokys@gmail.com>
Date: Thu, 24 Mar 2016 17:13:10 +0100
Subject: [PATCH] Handle TreeDataTemplate.ItemsSelector == null.

---
 .../Generators/TreeItemContainerGenerator.cs              | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/src/Perspex.Controls/Generators/TreeItemContainerGenerator.cs b/src/Perspex.Controls/Generators/TreeItemContainerGenerator.cs
index 3dd3fa904b..cd19f53b60 100644
--- a/src/Perspex.Controls/Generators/TreeItemContainerGenerator.cs
+++ b/src/Perspex.Controls/Generators/TreeItemContainerGenerator.cs
@@ -77,7 +77,13 @@ namespace Perspex.Controls.Generators
                 var result = new T();
 
                 result.SetValue(ContentProperty, template.Build(item));
-                BindingOperations.Apply(result, ItemsProperty, template.ItemsSelector(item), null);
+
+                var itemsSelector = template.ItemsSelector(item);
+
+                if (itemsSelector != null)
+                {
+                    BindingOperations.Apply(result, ItemsProperty, itemsSelector, null);
+                }
 
                 if (!(item is IControl))
                 {