Lookup column with writeback

Question

Has anyone ever made a sharepoint lookup column that allows fill inn choices and does writeback to the list it does lookup from? what would it take to make such a column?

If a 3.rd party solution is arround that would be realy great to :)

Cheers!

Answer 1

You'll need to create a custom field type:

http://msdn.microsoft.com/en-us/library/ms446361.aspx

Answer 2

On a project i've worked on we used a TagControl FieldType, with an entry field and a multiple select field. A user could enter a new Tag or select an existing one. If you are interested, i could send you the code.