Crystal Reports Wrap Text in a iTextObject

Message

     Hello,
i use crystal 10 and aspnet 3.5 (vb2008).
i have the problem. wrap text in a textobject

this is my code:

Dim txt As CrystalDecisions.CrystalReports.Engine.TextObject

txt = report.ReportDefinition.ReportObjects("txtobject")

I try
txt.Text = vbCrLf & "MyText"
Or 
txt.Text = chr(13) & "MyText"

but not it works. my text not change line.
thank you