How can I make the grid-lines in Microsoft Excel (2007) like this in the picture ?

How can I make the grid-lines in Microsoft Excel (2007) like this in the picture ?
In population pyramid, I need dot grid lines on one side and solid lines on another side!
I can make either dot ones or the solid ones but not both ones in a single graph? Can anybody say me whats the trick ?

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Nick's picture

no way that I know of...

no way that I know of... unless you create 2 charts and position them next to each other...