Hello
how can i select a report from another report.
that means, for example when i select a row i can display another report.

I think that i should specify the 2nd report in action properties on the .rdlc file.
But, by doing that, i had an error message when clicking the appropriate row : "A data source instance has not been supplied for the data source'ReportsSLA_SLAYesterday"

thanks for your help

You need to handle the Drillthrough event and supply data for the second report.
http://msdn.microsoft.com/en-us/library/microsoft.reporting.winforms.reportviewer.drillthrough(VS.80).aspx
Alsotake a look at the DrillThrough report examples on http://gotreportviewer.com/