Is there any way that I can add an additional check box to the "Additional Column Settings" section of a Column in a list? I'm talking about the section pictured below:

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I don't even know where to start looking for how I would do something like this, so any tutorials, links, or terms I should search on would be greatly appreciated. Once I have this extra check box I would like to change the functionality of this text box based on the selection...

  • Could you please share your solution with me. I'm trying to do somewhat exactly the same thing. I need to put a checkbox called Enforce Unique Value For People Picker. Basically my form will have multiple number of People Picker. When user check this, it will check other People Picker control on the form that also have this attribute checked. Thanks Sep 5, 2012 at 10:57

1 Answer 1


As posted in your other post here, you would have to create a new field type. In your case, I think you will want to work with the class SPFieldText.

  • I have figured out how to add my own, but I still don't see how I can add to the "Additional Column Settings". Do you know somewhere I could look to find that? Jun 10, 2011 at 21:22
  • Not that I know of. Could you perhaps share what it is you are trying to achieve and someone could lead you down that road? Jun 10, 2011 at 21:31
  • 3
    Nevermind, I found how to do that here: msdn.microsoft.com/en-us/library/aa543558.aspx Jun 10, 2011 at 21:32

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