Path where all web control stored in EP is as follows C:\Program Files\Common Files\Microsoft Shared\Web Server Extensions\12\TEMPLATE\LAYOUTS\ep if you are doing any change in ax web control then you need to do change in EP folder also to reflect changes easily. If you make changes but you did not done seen changes at the time of run then you need to refresh AOT and data diction at home page. if you want to write some code on change event of any control then you need to set autopostback true property then on form set updatepostback to true than you can write override method modified in AOT and can do any code.
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