How to scale the size of Pane to make it fit a Grid element?

I am wanting to make a Pane scale to fit (if Spacings are zero) a Grid element.

Grid[{{x, x,
   Framed[
    Pane[x,
     ImageSize -> {Scaled[1], Scaled[1]},
     ImageMargins -> 0,
     Alignment -> Center],
    FrameMargins -> 0,
    ImageMargins -> 0], x, x}, {x, x, x, x, x}, {x, x, x, x, x}}, 

 Background -> {None, None, {{1, 3} -> Red}}, ItemSize -> {5, 5},
 Frame -> All,
 Spacings -> {0, 0}]

Note that I added the Frame solely to outline the Pane so that the dimensions could be seen.

On my system, OS X 10.6.8, Mma V8.0.4, the scaling works in the x direction but not in the y direction. Can anyone offer an explanation and solution (or could this be a bug)?

enter image description here

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