diff --git a/modules/gui/pymod/dng/superpositiondialog.py b/modules/gui/pymod/dng/superpositiondialog.py
index 3928adf7d75af3f4e36b00e84de43a33b507ad91..f8b004fbf16404779f1ace7434fe06d02800e6ef 100644
--- a/modules/gui/pymod/dng/superpositiondialog.py
+++ b/modules/gui/pymod/dng/superpositiondialog.py
@@ -43,7 +43,7 @@ class ChainComboBox(QComboBox):
 
   def focusOutEvent (self, event):
     if self.gfx:
-      self.gfx.SetSelection(self.entity.Select('cname=All'))
+      self.gfx.selection = None
 
   def SetItems(self, ent, gfx):
     self.clear()