hidden column on a grid

Hello,

I want to hidden columns on a grid, so I set the parameter setHidden
in each column to true. But I don't want to see this column when I
push on the drop down button. I try it with css style but I still see
the column, what can I do??

I put some code of the column configuration:
ColumnConfig reportDateColumnConfig = new ColumnConfig("",
FIELD_DATE_REPORT, 0, false,null,FIELD_DATE_REPORT);
reportDateColumnConfig.setHidden(true);
reportDateColumnConfig.setCss("overflow: hidden;");

I hope somebody could help.

Thanks.

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