How do I get a ExtJS 4.1.X Bar Chart with a single bar to show that bar's label properly?

How do I get a ExtJS 4.1.X Bar Chart with a single bar to show that bar's
label properly?

References

Reference NO 1

http://stackoverflow.com/questions/13586981/how-do-i-get-a-extjs-4-1-x-bar-chart-with-a-single-bar-to-show-that-bars-label

Reference NO 2

http://stackoverflow.com/questions/17386221/extjs4-1-customize-label-in-bar-chart

Reference NO 3

http://www.sencha.com/forum/showthread.php?210589-Set-maximum-bar-width-in-ExtJS-4-column-chart

Reference NO 4

http://www.rahulsingla.com/blog/2011/04/extjs-4-vertically-stacked-side-by-side-multiple-charts

Reference NO 5

http://www.quizzpot.com/courses/learning-ext-js-3/articles/charts-with-extjs

Reference NO 6

http://www.learnsomethings.com/2011/05/12/look-ma-no-flash-extjs-4-0-chart-click-event-tips-tricks-and-at-least-one-hack-to-identify-which-grouped-bar-instance-has-been-clicked-in-a-grouped-bar-chart/

Reference NO 7

http://mapserver.sara.nl/atlas/include/ext-4.2.0.663/release-notes.html

Reference NO 8

https://github.com/probonogeek/extjs/tree/master/docs/guides/upgrade