Filter control in field header - List page

Hello,

I have a list page where I am filtering data on the Before SQL query event using the $strWhereClause and also have enabled the filter control in field headers. Althougth, the records on the list page are filtered based on the $strWhereClause, the filter controls are showing all values from all records event those excluded by the $strWhereClause.

Is there a workaroung on that?

Best
George