Could you post the SET FILTER command?

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>I am using the excelent GridHighLighter class from Nick Neklioudov. I have a grid that highlight rows based on an expresion.
>No problem here, the thing is that whenever I try to filter the records with SET FILTER the error "Operator/Operand type mismatch" raises.
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>Has someone succesfully used SET FILTER with this class?
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>Thanks in advance