Visual Studio 2008; Crystal Reports - Unable to extend a verticle line to the bottom of the page

I'm a bit new to C#/.net.  I'm creating a Windows Forms Application using Visual Studio 2008. 
I'm having a problem formatting an Invoice Report using Crystal Reports (which is built into VS 2008). 
I need the invoice report to have vertical lines extending to the bottom of the page. 
There is a setting to "extend line to bottom of section", but if there are only a few detail lines, then I can't extend the line beyond the last detail line.  The data source is a data table, so I can add blank lines.  However, since the description line may wrap to multiple lines, I can't calculate the number of lines based on the row counts with certantity.
I must be overlooking something.  Does anyone know of a way to extend the vertical lines beyond the last detail line to the bottom of the page?
Thank you very much in advance.
mf