Dear Alessio
My problem was solved with your solution.
i put these line in my code and everything work good.
but i dont understand why?

WITH thisform.pageframe1.page2.grid1
.RecordSource = ""
ENDWITH
WITH thisform.pageframe1.page2.grid1
.RecordSource = CursorTempB
.column1.ControlSource = "rbnum"
.column2.ControlSource = "rbdate"
.column3.ControlSource = "rbsen"
.column4.ControlSource = "rbrec"
ENDWITH

thanks for your help
Reza