diff --git a/wxPython/contrib/gizmos/gizmos.i b/wxPython/contrib/gizmos/gizmos.i
index e677f65e8c..ba673eba1d 100644
--- a/wxPython/contrib/gizmos/gizmos.i
+++ b/wxPython/contrib/gizmos/gizmos.i
@@ -553,9 +553,15 @@ public:
     void SetImageList(wxImageList *imageList);
     void SetStateImageList(wxImageList *imageList);
     void SetButtonsImageList(wxImageList *imageList);
+
     void AssignImageList(wxImageList *imageList);
+    %pragma(python) addtomethod = "AssignImageList:_args[0].thisown = 0"
+
     void AssignStateImageList(wxImageList *imageList);
+    %pragma(python) addtomethod = "AssignStateImageList:_args[0].thisown = 0"
+
     void AssignButtonsImageList(wxImageList *imageList);
+    %pragma(python) addtomethod = "AssignButtonsImageList:_args[0].thisown = 0"
 
 
 
diff --git a/wxPython/contrib/gizmos/gizmos.py b/wxPython/contrib/gizmos/gizmos.py
index 9ad14b4827..bbd10067db 100644
--- a/wxPython/contrib/gizmos/gizmos.py
+++ b/wxPython/contrib/gizmos/gizmos.py
@@ -375,12 +375,15 @@ class wxTreeListCtrlPtr(wxControlPtr):
         return val
     def AssignImageList(self, *_args, **_kwargs):
         val = gizmosc.wxTreeListCtrl_AssignImageList(self, *_args, **_kwargs)
+        _args[0].thisown = 0
         return val
     def AssignStateImageList(self, *_args, **_kwargs):
         val = gizmosc.wxTreeListCtrl_AssignStateImageList(self, *_args, **_kwargs)
+        _args[0].thisown = 0
         return val
     def AssignButtonsImageList(self, *_args, **_kwargs):
         val = gizmosc.wxTreeListCtrl_AssignButtonsImageList(self, *_args, **_kwargs)
+        _args[0].thisown = 0
         return val
     def AddColumn(self, *_args, **_kwargs):
         val = gizmosc.wxTreeListCtrl_AddColumn(self, *_args, **_kwargs)