--- a/controls/VariablePanel.py	Sun Jul 01 23:36:44 2012 +0200
+++ b/controls/VariablePanel.py	Sat Jul 07 20:48:23 2012 +0200
@@ -272,7 +272,10 @@
                             elif base_type not in LOCATIONDATATYPES[location[0]]:
                                 message = _("Incompatible size of data between \"%s\" and \"%s\"")%(location, variable_type)
                             else:
-                                dialog = wx.SingleChoiceDialog(self.ParentWindow, _("Select a variable class:"), _("Variable class"), ["Input", "Output", "Memory"], wx.OK|wx.CANCEL)
+                                dialog = wx.SingleChoiceDialog(self.ParentWindow, 
+                                      _("Select a variable class:"), _("Variable class"), 
+                                      ["Input", "Output", "Memory"], 
+                                      wx.DEFAULT_DIALOG_STYLE|wx.OK|wx.CANCEL)
                                 if dialog.ShowModal() == wx.ID_OK:
                                     selected = dialog.GetSelection()
                                     if selected == 0: