diff -r abcadb7e2ef1 -r 1822c37b2688 tuikit/core/widget.py
--- a/tuikit/core/widget.py	Wed Sep 03 08:53:44 2014 +0200
+++ b/tuikit/core/widget.py	Wed Sep 03 08:57:06 2014 +0200
@@ -65,7 +65,7 @@
 
     @property
     def size(self):
-        return self._size.readonly()
+        return self._size.immutable()
 
     def resize(self, w, h):
         self._size.update(w, h)