diff -r c89fc366bebd -r 0ffb41625592 dialogs/SearchInProjectDialog.py
--- a/dialogs/SearchInProjectDialog.py	Thu Sep 02 21:36:29 2021 +0200
+++ b/dialogs/SearchInProjectDialog.py	Thu Sep 02 22:18:14 2021 +0200
@@ -54,59 +54,59 @@
 
         pattern_sizer = wx.FlexGridSizer(cols=2, hgap=5, rows=2, vgap=5)
         pattern_sizer.AddGrowableCol(0)
-        main_sizer.AddSizer(pattern_sizer, border=20,
+        main_sizer.Add(pattern_sizer, border=20,
                             flag=wx.GROW | wx.TOP | wx.LEFT | wx.RIGHT)
 
         pattern_label = wx.StaticText(self, label=_('Pattern to search:'))
-        pattern_sizer.AddWindow(pattern_label, flag=wx.ALIGN_BOTTOM)
+        pattern_sizer.Add(pattern_label, flag=wx.ALIGN_BOTTOM)
 
         self.CaseSensitive = wx.CheckBox(self, label=_('Case sensitive'))
-        pattern_sizer.AddWindow(self.CaseSensitive, flag=wx.GROW)
+        pattern_sizer.Add(self.CaseSensitive, flag=wx.GROW)
 
         self.Pattern = wx.TextCtrl(self, size=wx.Size(250, -1))
         self.Bind(wx.EVT_TEXT, self.FindPatternChanged, self.Pattern)
-        pattern_sizer.AddWindow(self.Pattern, flag=wx.GROW)
+        pattern_sizer.Add(self.Pattern, flag=wx.GROW)
         self.Bind(wx.EVT_CHAR_HOOK, self.OnEscapeKey)
         self.RegularExpression = wx.CheckBox(self, label=_('Regular expression'))
-        pattern_sizer.AddWindow(self.RegularExpression, flag=wx.GROW)
+        pattern_sizer.Add(self.RegularExpression, flag=wx.GROW)
 
         scope_staticbox = wx.StaticBox(self, label=_('Scope'))
         scope_sizer = wx.StaticBoxSizer(scope_staticbox, wx.HORIZONTAL)
-        main_sizer.AddSizer(scope_sizer, border=20,
+        main_sizer.Add(scope_sizer, border=20,
                             flag=wx.GROW | wx.LEFT | wx.RIGHT)
 
         scope_selection_sizer = wx.BoxSizer(wx.VERTICAL)
-        scope_sizer.AddSizer(scope_selection_sizer, 1, border=5,
+        scope_sizer.Add(scope_selection_sizer, 1, border=5,
                              flag=wx.GROW | wx.TOP | wx.LEFT | wx.BOTTOM)
 
         self.WholeProject = wx.RadioButton(self, label=_('Whole Project'), style=wx.RB_GROUP)
         self.WholeProject.SetValue(True)
         self.Bind(wx.EVT_RADIOBUTTON, self.OnScopeChanged, self.WholeProject)
-        scope_selection_sizer.AddWindow(self.WholeProject, border=5,
+        scope_selection_sizer.Add(self.WholeProject, border=5,
                                         flag=wx.GROW | wx.BOTTOM)
 
         self.OnlyElements = wx.RadioButton(self, label=_('Only Elements'))
         self.Bind(wx.EVT_RADIOBUTTON, self.OnScopeChanged, self.OnlyElements)
         self.OnlyElements.SetValue(False)
-        scope_selection_sizer.AddWindow(self.OnlyElements, flag=wx.GROW)
+        scope_selection_sizer.Add(self.OnlyElements, flag=wx.GROW)
 
         self.ElementsList = wx.CheckListBox(self)
         self.ElementsList.Enable(False)
-        scope_sizer.AddWindow(self.ElementsList, 1, border=5,
+        scope_sizer.Add(self.ElementsList, 1, border=5,
                               flag=wx.GROW | wx.TOP | wx.RIGHT | wx.BOTTOM)
 
         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(self, 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(self, label=_("Close"))
         self.Bind(wx.EVT_BUTTON, self.OnCloseButton, self.CloseButton)
-        buttons_sizer.AddWindow(self.CloseButton)
+        buttons_sizer.Add(self.CloseButton)
 
         self.SetSizer(main_sizer)