How to reduce the distance between the buttons of the taskbar

[rajtheeban]

Hi

I almost finished my theme for windows 7, but to make correctly my visual style for this OS, i would like to reduce the distance between the buttons in the taskbar, like shown in the screenshot:



i would like there is no space...

This problem doesn't exist with vista
i modified the images concerned, but it's not enought
i also changed the Sizing and contentMargins properties, without success

how to reduce this size? (it is possible?)

help