Passing Multi-Select Dashlet Parameter

I have an Ad Hoc that has an "is one off" Filter on it.  When I add the Dashlet and the Filter to the Dashboard is shows as a Multi-Select Filter. 

I enabled hyperlinks on the Dashlet to pass the filtered value(s) into another Dashboard with more detailed data with the following URL format:

repo:/xxx/Dashboards/XX_YY_Dashboard?YY_1=$P{YY}

If I only select one value the XX_YY_Dashboard displays correctly filtering the single YY value. If I select multiple values the XX_YY_Dashboard ignores the filter and shows all YY results. 

Is there a way to pass multi-select Filters?

Thanks