Note: There seems to be a bug in the PropertySchema element rendering system. The edit form for the list field does not bind the custom field property values to the form control correctly. Instead of binding the to the property values, the form binds to the property display names. The only known workaround is to use the next option.
Reviewing the business cases that justify creation of custom field types
Comparison between custom field types and other WSS extensibility
Code walkthrough and demo of several custom field type implementations
Closeout Additional Resources Black Blade Associates http://www.blackbladeinc.com “Things that should be Easy” by Eugene Rosenfeld http://thingsthatshouldbeeasy.blogspot.com/ Phone number custom field type by Morgan Everett & Mark Collins http://www.sharethispoint.com/archive/2006/08/07/23.aspx#codetwo SharePoint SDK sample: How to create a custom field control http://msdn2.microsoft.com/en-us/library/aa981226.aspx SharePoint Server 2007 Visual How Tos http://msdn2.microsoft.com/en-us/library/bb530308.aspx
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