Java Development Tools

I am using ADF 11.1.2.4.0.

I would like to disable a button based on the value of a column in a table.

AuthorCn is the column on the table to which I created an attribute binding.

The disable property on the button is set as follows:

    disabled="#{bindings.AuthorCn == 'Yes'}

I have also set the triggers property of the button to the id of the table.

When the value of the column is "Yes", the button should be disabled;  otherwise, it should be enabled.

This is not working.  The button is not disabled, regardless of the value of the column in the current row of the table.

Any ideas?

Thanks in advance