Task button text moves down when clicked

Hi, I'm currently trying to create a skin, and I have a small problem.

I want to create a 'flat' taskbar without 3d elements, however for some reason windows draws the button contents 1 pixel lower and 1 pixel more to the right when the button is clicked or selected. I can see that it looks better that way on a 'pushed' 3d button, but it looks totally crap when the button is not 3d.

Is there any way that I can turn this off, or counter-act it somehow? Thanks.
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