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Looks like you are using incorrect link for extjs. Change it to https://cdn.sencha.com/ext/gpl/4.2.1/ext-all.js
So you have tabpanel with 2 tabs each containing a grid, correct? If so, you can assign each grid to a variable (grid1, grid2) and then use grid1.el.select(your-css-selector). Should solve your problem.