Problem in report viewer binding in WPF

Hi Everybody,

                 I'm using reportviewer in my project. In datagrid i list the employee details. And when i check some of the rows in datagrid, for that employees i have show payslip on one report viewer by separate page.

Now i have to show payslip for John and James.

Now my problem is i cant bind more than one record in reportviewer. Which i click the row only displaying in reportviewer. I want for those which are all the rows are checked.