Fixed pallet colors in Pi Chart

[dsmuker]

Hi

I have a cross tab within which i have pi chart. it works perfect and displays the correct values. 
Unfortunately, the palette color it chooses differs for each chart. for example i am displaying the number of issues in different projects based on the criticality (Extreme,High and Medium). For one chart, the color codes are red, green and blue for extreme, high and medium criticality. whereas in other chart the colors are same but for different criticality (red for medium etc). Is there any way i can fix the colors based on criticality for each chart within the cross tab?

Cheers