diff --git a/include/wx/generic/treectrl.h b/include/wx/generic/treectrl.h
index 7d1dd7e39d..b08f4d8f5a 100644
--- a/include/wx/generic/treectrl.h
+++ b/include/wx/generic/treectrl.h
@@ -312,6 +312,8 @@ public:
 
         // expand this item
     void Expand(const wxTreeItemId& item);
+        // expand this item and all subitems recursively
+    void ExpandAll(const wxTreeItemId& item);
         // collapse the item without removing its children
     void Collapse(const wxTreeItemId& item);
         // collapse the item and remove all children