Index: tkSimpleDialog.py
===================================================================
--- tkSimpleDialog.py	(revision 51213)
+++ tkSimpleDialog.py	(working copy)
@@ -46,8 +46,10 @@
             title -- the dialog title
         '''
         Toplevel.__init__(self, parent)
-        self.transient(parent)
 
+        if parent.winfo_viewable():  
+            self.transient(parent)
+ 
         if title:
             self.title(title)