SQL Server 2005 Database Diagram: allow nulls versus nullable

For a custom view in a SQL Server 2005 Database Diagram, I have both of the following column choices:
  Nullable - shows Yes or No
  Allow Nulls - shows checkbox (checked or not)

The values seem to be redundant. Is there any difference in these columns or is it purely for display purposes of Yes/No vs Checkbox?

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Aneesh RetnakaranConnect With a Mentor Database AdministratorCommented:
there is no difference
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