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I'm learning ExtJS 4 and I just figured out how to center containers/panels. In order to do this I needed to add the following at the top of my my app.js
Ext.Loader.setPath('Ext.ux', 'extjs/examples/ux');
Ext.require('Ext.ux.layout.Center');
The ux folder is in the example folder that came with ExtJS 4, I'm wondering why this package and some others are in the examples folder rather than being in the src folder with the rest of the framework.
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Ext JS is basically used for creating desktop applications. It supports all the modern browsers such as IE6+, FF, Chrome, Safari 6+, Opera 12+, etc. Whereas another product of Sencha, Sencha Touch is used for mobile applications. Ext JS is based on MVC/MVVM architecture.
It is a free, limited commercial use license, with robust Ext JS Frameworks, hundreds of modern components, a material theme, and more to develop stunning-looking apps. Since the launch, we've been excited to see the growing interest.
Because Sencha considers them being "beta-code". Often code what was in ux will be included into main code branch in the following releases.
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