1. Configure a skin
2. Click on the cross to quit the tool
3. A dialog box is displayed asking if you want to quit without saving
4. Click on yes
5. The tool is not closed and we get this error :

   Uncaught ReferenceError: me is not defined
   (anonymous function) @ SkinConfigurationTool.js:190
   Ext.apply.callback @ ext-all-debug.js:8439
   (anonymous function) @ ext-all-debug.js:6695
   Ext.define.btnCallback @ ext-all-debug.js:158194
   Ext.apply.callback @ ext-all-debug.js:8439
   Ext.define.fireHandler @ ext-all-debug.js:130646
   Ext.define.onClick @ ext-all-debug.js:130634
   fire @ ext-all-debug.js:20223
   Ext.define.fire @ ext-all-debug.js:32463
   Ext.define.publish @ ext-all-debug.js:32439
   Ext.define.doDelegatedEvent @ ext-all-debug.js:32489
   Ext.define.onDelegatedEvent @ ext-all-debug.js:32476
   (anonymous function) @ ext-all-debug.js:6662
   

Note that the "Quit without saving" button in the ribbon is working perfectly