http://msdn.microsoft.com/en-us/dynamics/ax/cc507280.aspx
Videos at CustomerSource
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Creating simple Enterprise Portal Lookups using EDT, DataSetField and custom lookups using DataSet or User Controls in Microsoft Dynamics AX 2012: http://mediadl.microsoft.com/mediadl/www/d/dynamics/customersource/CCAX2012HT0030_Enterprise%20Portal%20Lookup.wmv
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Understanding record context when interacting with data in the Enterprise Portal for Microsoft Dynamics AX 2012: http://mediadl.microsoft.com/mediadl/www/d/dynamics/customersource/CCAX2012HT0029_Enterprise%20Portal%20Record%20Context.wmv
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List page development in the Microsoft Dynamics AX 2012 Enterprise Portal: http://mediadl.microsoft.com/mediadl/www/d/dynamics/customersource/CCAX2012HT0031_Enterprise%20Portal%20List%20Page%20Development.wmv
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Detail page development in the Microsoft Dynamics AX 2012 Enterprise Portal: http://mediadl.microsoft.com/mediadl/www/d/dynamics/customersource/AX2012CoreConceptsVideo_CCAX2012HT0032_EPDetailsPagesDev.wmv
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Developing detail page interactions with Microsoft Dynamics AX 2012 Enterprise Portal, Part1: http://mediadl.microsoft.com/mediadl/www/d/dynamics/customersource/nCCAX2012DI0015_1_Enterprise%20Portal%20Details%20Page%20Interaction%20Patterns%20-%20Part%201.wmv
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Developing detail page interactions with Microsoft Dynamics AX 2012 Enterprise Portal, Part2: http://mediadl.microsoft.com/mediadl/www/d/dynamics/customersource/CCAX2012DI0015_2_Enterprise%20Portal%20Details%20Page%20Interaction%20Patterns%20-%20Part%202.wmv
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Debugging customizations and new development with the Enterprise Portal for Microsoft Dynamics AX 2012: http://mediadl.microsoft.com/mediadl/www/d/dynamics/customersource/CCAX2012HT0028_Enterprise%20Portal%20Debugging.wmv