diff -r c89fc366bebd -r 0ffb41625592 dialogs/FindInPouDialog.py
--- a/dialogs/FindInPouDialog.py	Thu Sep 02 21:36:29 2021 +0200
+++ b/dialogs/FindInPouDialog.py	Thu Sep 02 22:18:14 2021 +0200
@@ -48,76 +48,76 @@
         main_sizer.AddGrowableRow(0)
 
         controls_sizer = wx.BoxSizer(wx.VERTICAL)
-        main_sizer.AddSizer(controls_sizer, border=20,
+        main_sizer.Add(controls_sizer, border=20,
                             flag=wx.GROW | wx.TOP | wx.LEFT | wx.RIGHT)
 
         patterns_sizer = wx.FlexGridSizer(cols=2, hgap=5, rows=1, vgap=5)
         patterns_sizer.AddGrowableCol(1)
-        controls_sizer.AddSizer(patterns_sizer, border=5, flag=wx.GROW | wx.BOTTOM)
+        controls_sizer.Add(patterns_sizer, border=5, flag=wx.GROW | wx.BOTTOM)
 
         find_label = wx.StaticText(panel, label=_("Find:"))
-        patterns_sizer.AddWindow(find_label, flag=wx.ALIGN_CENTER_VERTICAL)
+        patterns_sizer.Add(find_label, flag=wx.ALIGN_CENTER_VERTICAL)
 
         self.FindPattern = wx.TextCtrl(panel)
         self.Bind(wx.EVT_TEXT, self.OnFindPatternChanged, self.FindPattern)
         self.Bind(wx.EVT_CHAR_HOOK, self.OnEscapeKey)
-        patterns_sizer.AddWindow(self.FindPattern, flag=wx.GROW)
+        patterns_sizer.Add(self.FindPattern, flag=wx.GROW)
 
         params_sizer = wx.BoxSizer(wx.HORIZONTAL)
-        controls_sizer.AddSizer(params_sizer, border=5, flag=wx.GROW | wx.BOTTOM)
+        controls_sizer.Add(params_sizer, border=5, flag=wx.GROW | wx.BOTTOM)
 
         direction_staticbox = wx.StaticBox(panel, label=_("Direction"))
         direction_staticboxsizer = wx.StaticBoxSizer(
             direction_staticbox, wx.VERTICAL)
-        params_sizer.AddSizer(direction_staticboxsizer, 1, border=5,
+        params_sizer.Add(direction_staticboxsizer, 1, border=5,
                               flag=wx.GROW | wx.RIGHT)
 
         self.Forward = wx.RadioButton(panel, label=_("Forward"),
                                       style=wx.RB_GROUP)
-        direction_staticboxsizer.AddWindow(self.Forward, border=5,
+        direction_staticboxsizer.Add(self.Forward, border=5,
                                            flag=wx.ALL | wx.GROW)
 
         self.Backward = wx.RadioButton(panel, label=_("Backward"))
-        direction_staticboxsizer.AddWindow(self.Backward, border=5,
+        direction_staticboxsizer.Add(self.Backward, border=5,
                                            flag=wx.ALL | wx.GROW)
 
         options_staticbox = wx.StaticBox(panel, label=_("Options"))
         options_staticboxsizer = wx.StaticBoxSizer(
             options_staticbox, wx.VERTICAL)
-        params_sizer.AddSizer(options_staticboxsizer, 1, flag=wx.GROW)
+        params_sizer.Add(options_staticboxsizer, 1, flag=wx.GROW)
 
         self.CaseSensitive = wx.CheckBox(panel, label=_("Case sensitive"))
         self.CaseSensitive.SetValue(True)
-        options_staticboxsizer.AddWindow(self.CaseSensitive, border=5,
+        options_staticboxsizer.Add(self.CaseSensitive, border=5,
                                          flag=wx.ALL | wx.GROW)
 
         self.WrapSearch = wx.CheckBox(panel, label=_("Wrap search"))
         self.WrapSearch.SetValue(True)
-        options_staticboxsizer.AddWindow(self.WrapSearch, border=5,
+        options_staticboxsizer.Add(self.WrapSearch, border=5,
                                          flag=wx.LEFT | wx.RIGHT | wx.BOTTOM | wx.GROW)
 
         self.RegularExpressions = wx.CheckBox(panel, label=_("Regular expressions"))
-        options_staticboxsizer.AddWindow(self.RegularExpressions, border=5,
+        options_staticboxsizer.Add(self.RegularExpressions, border=5,
                                          flag=wx.LEFT | wx.RIGHT | wx.BOTTOM | wx.GROW)
 
         buttons_sizer = wx.BoxSizer(wx.HORIZONTAL)
-        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.FindButton = wx.Button(panel, label=_("Find"))
         self.FindButton.SetDefault()
         self.Bind(wx.EVT_BUTTON, self.OnFindButton, self.FindButton)
-        buttons_sizer.AddWindow(self.FindButton, border=5, flag=wx.RIGHT)
+        buttons_sizer.Add(self.FindButton, border=5, flag=wx.RIGHT)
 
         self.CloseButton = wx.Button(panel, label=_("Close"))
         self.Bind(wx.EVT_BUTTON, self.OnCloseButton, self.CloseButton)
-        buttons_sizer.AddWindow(self.CloseButton)
+        buttons_sizer.Add(self.CloseButton)
 
         # set the longest message here, to use it length to calculate
         # optimal size of dialog window
         self.RegExpSyntaxErrMsg = _("Syntax error in regular expression of pattern to search!")
         self.StatusLabel = wx.StaticText(panel, label=self.RegExpSyntaxErrMsg)
-        controls_sizer.AddWindow(self.StatusLabel, flag=wx.ALIGN_CENTER_VERTICAL)
+        controls_sizer.Add(self.StatusLabel)
 
         panel.SetSizer(main_sizer)
         main_sizer.Fit(self)