change datagridview foreground color

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VB

WPF

color

DataGridView

hey guys, new problem:
i have 2 datagridview in my wpf window: DgIncome and DgOutcome.
the DgIncome foreground is set to green and the DgOutcome foreground is set to red.
on both datagridviews, when i click one of the rows, the cell foreground changes to white and that ok.
whats the problem? assuming i clicked one item in the DgIncome, the row is now white. now, i go to the DgOutcome and click it. the result: the item in the DgIncome does not return to its original color, Green, but changes to black. it goes both ways.
i tryed solving it threw the <style> or the datagridview properties but with zero success.
any code would be usefull...
thanks,
oron.