Tablix problem

Hi

I need to had some extra blank rows to my tablix using SSRS Report Builder. 

Example : There are only 3 values to my database and I need 25 rows on every page to fill the page. These extra rows needs to be blank with no values in them. I tried to use CEILING(RowNumber(nothing)/25) but it won't had extra rows if there are no values to fill them.

Thank you very much