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From SharePoint Knowledge Base

Hi guys I just discovered a great tool that can help you a lot, It is called sharepoint view boost, you can get it from [www.sharepointboost.com] The function it provides is quite simple: If you get a large number of list to check out, you can just click a menu item in the Actions menu and there will be "collapse/expand" button on the top of every column in the view header. By clicking the "collapse/expand" button, you can collapse or expand the column. This is a great, here is my problem: Is there any one who can give me some clues so that I can expand items in this way? I know I CAN DO THIS USING GROUP BY BUTTON BUT SPECIFICALLY HOW? THANKS IN ADVANCE.