From 4af6ea2b3cd2c24c3022fd9bc07dcda3df5ba534 Mon Sep 17 00:00:00 2001
From: sgay <unknown@kiln.example.com>
Date: Thu, 20 Jan 2011 14:04:32 -0100
Subject: [PATCH] fix #29929

---
 .../presentation/umbraco/Trees/TreeDefinitionCollection.cs    | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/umbraco/presentation/umbraco/Trees/TreeDefinitionCollection.cs b/umbraco/presentation/umbraco/Trees/TreeDefinitionCollection.cs
index 15985c4c1b..42410629d0 100644
--- a/umbraco/presentation/umbraco/Trees/TreeDefinitionCollection.cs
+++ b/umbraco/presentation/umbraco/Trees/TreeDefinitionCollection.cs
@@ -64,7 +64,9 @@ namespace umbraco.cms.presentation.Trees
             TreeDefinition foundTree = this.Find(
                delegate(TreeDefinition t)
                {
-                   return t.TreeType.Equals(typeof(T));
+                   // zb-00002 #29929 : use IsAssignableFrom instead of Equal, otherwise you can't override build-in
+                   // trees because for ex. PermissionEditor.aspx.cs OnInit calls FindTree<loadContent>()
+                   return typeof(T).IsAssignableFrom(t.TreeType);
                }
            );
             if (foundTree != null)