To all ...
Deb had sent me a private email to ask me this question. I already replied to her but thought the information might be helpful to others so I'm posting it again here.
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Boy ... I had never run in to this issue before but I did a little testing and you're right! It appears that if a line has been stretched thru bands ... it ends up in the background and other objects appear on top of it. My guess is that it's because the line is drawn first, since it starts in the Page Header. Then the other objects, such as group objects are drawn on top of it, therefore, covering the line.
But alas ... there's always a way around it. Instead of trying to force the line to the front (which is obviously out of your control) just draw another shorter line right on top of it that covers just the gray rectangle. When it prints, it will look like one single line!
And here's another tip ... you mentioned that you are printing a light gray box. If you are printing this report on a black and white printer (no color printing), make the box yellow instead of gray. When yellow is converted to black and white ... it's a shade lighter than the gray color you can select in the report writer. I've had to do that for clients who needed to fax the reports and the "gray" was too dark for faxing.