diff -r bc2e98641bdd -r 2a9d4eafaddd Viewer.py
--- a/Viewer.py	Sun Jul 01 23:36:44 2012 +0200
+++ b/Viewer.py	Sat Jul 07 20:48:23 2012 +0200
@@ -263,7 +263,10 @@
                 if pou_type == "program":
                     location = values[0]
                     if not location.startswith("%"):
-                        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()
                         else:
@@ -2232,7 +2235,9 @@
         for block in self.Blocks.itervalues():
             if isinstance(block, SFC_Step):
                 choices.append(block.GetName())
-        dialog = wx.SingleChoiceDialog(self.ParentWindow, _("Add a new jump"), _("Please choose a target"), choices, wx.OK|wx.CANCEL)
+        dialog = wx.SingleChoiceDialog(self.ParentWindow, 
+              _("Add a new jump"), _("Please choose a target"), 
+              choices, wx.DEFAULT_DIALOG_STYLE|wx.OK|wx.CANCEL)
         if dialog.ShowModal() == wx.ID_OK:
             id = self.GetNewId()
             value = dialog.GetStringSelection()
@@ -2535,7 +2540,9 @@
         for block in self.Blocks.itervalues():
             if isinstance(block, SFC_Step):
                 choices.append(block.GetName())
-        dialog = wx.SingleChoiceDialog(self.ParentWindow, _("Edit jump target"), _("Please choose a target"), choices, wx.OK|wx.CANCEL)
+        dialog = wx.SingleChoiceDialog(self.ParentWindow, 
+              _("Edit jump target"), _("Please choose a target"), 
+              choices, wx.DEFAULT_DIALOG_STYLE|wx.OK|wx.CANCEL)
         dialog.SetSelection(choices.index(jump.GetTarget()))
         if dialog.ShowModal() == wx.ID_OK:
             value = dialog.GetStringSelection()