Merge pull request #901 from jchang10/jchang10_mycustom

Jchang10 mycustom

Author: alexcjohnson

dash/dash.py

@@ -441,6 +441,7 @@ def layout(self, value):
                 'or a function that returns '
                 'a dash component.')
 
+        self._cached_layout = None
         self._layout = value
 
     @property