Multi parmeter values dispalying in report header or designer in SSRS using SSAS Cube

Hi

I would like to display multi parmeter values in SSRS report using SSAS Cube

I tried pleacing  same parameter in report designer but  it is not displaying multi paremeter values.

Single parameter value, I am able to display.

Country regions are loading into parameter dropdown list box and I am able to select multi parameter values.

I would like to disply in report header or report designer like 

Country Region: USA, UK , APAC....

Thanks in advance,

Ramesh