diff -r c89fc366bebd -r 0ffb41625592 dialogs/IDMergeDialog.py
--- a/dialogs/IDMergeDialog.py	Thu Sep 02 21:36:29 2021 +0200
+++ b/dialogs/IDMergeDialog.py	Thu Sep 02 22:18:14 2021 +0200
@@ -15,11 +15,11 @@
         main_sizer = wx.BoxSizer(wx.VERTICAL)
 
         message = wx.StaticText(self, label=question)
-        main_sizer.AddWindow(message, border=20,
+        main_sizer.Add(message, border=20,
                              flag=wx.ALIGN_CENTER_HORIZONTAL | wx.TOP | wx.LEFT | wx.RIGHT)
 
         self.check = wx.CheckBox(self, label=optiontext)
-        main_sizer.AddWindow(self.check, border=20,
+        main_sizer.Add(self.check, border=20,
                              flag=wx.LEFT | wx.RIGHT | wx.BOTTOM | wx.ALIGN_CENTER_HORIZONTAL)
 
         buttons_sizer = wx.BoxSizer(wx.HORIZONTAL)
@@ -30,9 +30,9 @@
                 return lambda event: self.EndModal(_wxID)
 
             self.Bind(wx.EVT_BUTTON, OnButtonFactory(wxID), Button)
-            buttons_sizer.AddWindow(Button)
+            buttons_sizer.Add(Button)
 
-        main_sizer.AddSizer(buttons_sizer, border=20,
+        main_sizer.Add(buttons_sizer, border=20,
                             flag=wx.LEFT | wx.RIGHT | wx.BOTTOM | wx.ALIGN_RIGHT)
 
         self.SetSizer(main_sizer)