extjs - how to update my sencha app from Extjs2 to Extjs3? -

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i'm trying update sencha app extjs2.0 extjs 3, i'm finding bit difficulty in it.

actually developed application in extjs2 have use grid panel present in extjs3.

so when include extjs3 in current html file whole app crashes please help.... 

<!doctype html> <html> <head>     <meta http-equiv="content-type" content="text/html; charset=utf-8">      <title>picker</title>      <link rel="stylesheet" href="resources\css\sencha-touch.css" type="text/css">    <link rel="stylesheet" href="resources\css\ext-all-css.css" type="text/css">       <script type="text/javascript" src="ext-touch.js"></script>     <script type="text/javascript" src="ext-all.js"></script>              <script type="text/javascript" src="src\stocking.js"></script>       <script type="text/javascript" src="src\datafile.js"></script>      <script type="text/javascript" src="src\index.js"></script>     <style>         body {             background-color: #286999;             margin: 0;             padding: 0;         }     </style> </head> <body></body> </html>

you should @ official sencha migration guide first. there, should identify specific parts of application breaking. if layout issue, start commenting out individual panels 1 @ time find problem. once you've identified panel layout issue, start commenting out individual widgets might causing issue.

you should take advantage of debugging tools such firebug. use call stack navigator. may able use locate specific control problem.

edit: official guide gone interwebs... try http://www.sencha.com/forum/showthread.php?70352-upgrading-to-ext-3


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