Extjs 4 Store - disallow to add duplicates?

Extjs 4 Store - disallow to add duplicates?

References

Reference NO 1

http://stackoverflow.com/questions/15198373/extjs-4-store-disallow-to-add-duplicates

Reference NO 2

http://stackoverflow.com/questions/12488396/extjs4-model-with-user-defined-id

Reference NO 3

http://www.sencha.com/forum/showthread.php?187426-Prevent-duplicate-rows-in-grid

Reference NO 4

http://www.sencha.com/learn/working-with-components-in-ext-designer/

Reference NO 5

http://www.objis.com/formationextjs/lib/extjs-4.0.0/docs/api/Ext.view.View.html

Reference NO 6

http://edspencer.net/2009/09/16/using-the-extjs-row-editor/

Reference NO 7

http://ahlearns.wordpress.com/tag/grid/

Reference NO 8

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