Assigning CSS class to crosstab

Hi Experts

In my dashboard I have assigned a custom CSS class to one of my crosstabs. When I first run the dashboard, the crosstab is displayed using
my custom class. But when I do some kind of navigation (sort or similar) the crosstab goes back to using the standard CSS. 

I tried to correct this with adding a script command in the “On result set change” on the data source (script: “CROSSTAB_1.setCSSClass("showMeasure measureKPI");”) but this does not help. I still just get the standard CSS look.

Does someone know how it is possible to assign a custom CSS class to a crosstab and make the crosstab continuing the class?

We use DS 1.3 SP02.

Kind regards

Erik

Below is the class we use to hide some columns in the crosstab:

.showMeasure.measureKPI .sapzencrosstab-ColumnHeaderArea
td.sapzencrosstab-HeaderCellDefault:not(:nth-child(-n+17)) 

,.showMeasure.measureKPI .sapzencrosstab-DataArea
td.sapzencrosstab-DataCellDefault:not(:nth-child(-n+17))

{display: none;}