Export to pdf with background grid

Hi,

I'm exporting a set of wireframes (entire document) to a pdf. The =
graph-paper background grid disappears from the image when I do this, so =
the background is just plain white. Can anyone tell me how to get my =
grid into the output file?

My export settings are: PDF vector image, Entire Document, Include =
non-printing layers, 100%, No transparent background, No notes.

Thanks,


Ian.
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Dr Ian Piper
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