diff --git a/gui/wxpython/gmodeler/dialogs.py b/gui/wxpython/gmodeler/dialogs.py
index b09720cbea5..85e45a0d941 100644
--- a/gui/wxpython/gmodeler/dialogs.py
+++ b/gui/wxpython/gmodeler/dialogs.py
@@ -413,11 +413,11 @@ def _layout(self):
             border=5,
         )
         mainSizer.Add(
-            btnSizer, proportion=0, flag=wx.EXPAND | wx.ALL | wx.ALIGN_CENTER, border=5
+            btnSizer, proportion=0, flag=wx.EXPAND | wx.ALL, border=5
         )
 
         self.panel.SetSizer(mainSizer)
-        mainSizer.Fit(self.panel)
+        mainSizer.Fit(self)
 
         self.Layout()
         self.SetSize(self.GetBestSize())