how to compare by multiple selections in data grid ?

Hi By selecting the multiple rows in data grid we should compare  by selecting the action button of on change event as microflow. That comparison is "for example ,having two head sets with different specifications we will compare those features and will buy that product which is best", like that I want to do in mendix . please help me how to do in mendix using microflow giving in "on change event" of action button or else any other solution.    Thanks     
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