diff -r c89fc366bebd -r 0ffb41625592 editors/ProjectNodeEditor.py
--- a/editors/ProjectNodeEditor.py	Thu Sep 02 21:36:29 2021 +0200
+++ b/editors/ProjectNodeEditor.py	Thu Sep 02 22:18:14 2021 +0200
@@ -60,7 +60,7 @@
         ConfTreeNodeEditor.__init__(self, parent, controler, window, tagname)
 
         buttons_sizer = self.GenerateMethodButtonSizer()
-        self.MainSizer.InsertSizer(0, buttons_sizer, 0, border=5, flag=wx.ALL)
+        self.MainSizer.Insert(0, buttons_sizer, 0, border=5, flag=wx.ALL)
         self.MainSizer.Layout()
 
         self.VariableEditor = self.VariableEditorPanel