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Columns appear in column chooser but not in ultradatasource

I am binding a grid to a bindablelist of my objects.  I am using an ultradatasource to set the columns that I want to appear.  On one grid, the columns are correct and the column chooser is correct.  However, on another grid, the columns are correct, but the column chooser has unwanted columns marked as hidden, which the user can unhide.

 I am using the true flag during binding to hide new columns, as well as setting the new column behavior to hide.

 What must I be doing to allow these columns to appear in the column chooser?