Hi ,
One way is to have two series ; one series will have the bar values when the criteria value is Open , and when the criteria value is Closed , these same bar values will be NA() ; for the other series , it will be the other way around with the series having NA() when the criteria value is Open , and the bar values when the criteria value is Closed.
Plot both of these series , and manually set one series to red color and the other series to green color.
If this is not helpful , upload your workbook with the data and the pivot table and chart in it.
Narayan