Hi
thank you for reply
the expression I get is

"IIF(RECNO('csrtmpFile') <> this.parent.Gridhighlighter1.nRecno,'',RGB(0,0,128))"

I use messagebox to trace the line of code of error occured. I found that it happen when

>>SELECT 0
>>USE DBF("csrItemGrid") AGAIN SHARED IN 10 ALIAS csrtmpFile
>>CURSORSETPRO("Buffering", 5, "csrtmpFile")>
>>thisform.mygrid.RECORDSOURCE = "csrtmpFile"
>>thisform.gridhighlighter1.init()

It donesnt happen everytime. The error occured sometime only.
Any ideas??

thank you