Pop-up window not rendered properly when view model store is referenced by tree

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2. 
   
   
   

   
   

   
   

   Pop-up window not rendered properly when view model store is referenced by tree

   
   

   
   

   Pop-up window not rendered properly when view model store is referenced by tree

   
   
   
   

   
   

   I'm using extjs 5. I boiled this problem down to a fiddle containing a tree panel and a button. The button handler creates a pop-up window. But the window doesn't render properly.
   
   Fiddle: http://ift.tt/16oNRvk
   

   The problem seems to be due to the tree binding to a store:

   
   

   Ext.define('myApp.view.cm.CmDataTree', {
   
   extend: 'Ext.tree.Panel',
   
   alias: 'widget.dataTree',
   
   title: 'Data',
   
   width: 400,
   
   height: 500,
   
   viewModel: {
   
   type: 'cm'
   
   },
   
   bind: {
   
   store: '{cmStore}'
   
   }
   
   });

   
   

   If you replace the store binding with an empty store the pop-up window renders correctly:

   
   

   bind: {
   
   store: []
   
   }

   
   

   In my application the store and tree appear to work just fine. And the pop-up window is unrelated to them. Very odd!

   
   

   Thanks.

   
   

   
   

   
   

   
   

   
   

   
   
   
   

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Pop-up window not rendered properly when view model store is referenced by tree