Thanks for your help. I experimented with varying amount of colors (I didn't go as high as 37 though) and had little success but I realized that the order of the dataset has quite a big impact. In my case I was ordering by the sector name which with causing a scattering of colors as items were being picked out from random (not really random but can be thought as such) points in the dataset and put into the "other" group. I realised that if I order by the amount descending then this produces a more predictable spread of colour with less (or no) duplication.

I don't know if you guys have any control of the documentation but it would be worth mentioning this somewhere because it's not obvious at first and has quite a large impact on the coloring of the pie chart (or any other chart I imagine).

Cheers,

Your first notion is correct, the colors are applied before the smaller slices are grouped together into the "Others" category.

The thing about setting the OthersCategoryPercent was just to illustrate this point that the colors are being applied before the grouping. Hope this helps, and let me know how it goes -Paul

So are you saying that the colours are applied before the "Others" grouping is taking place? After making the last post I had a feeling that might be the case. Or is it because I'm not explicitly setting an OthersCategoryPercent?

Your problem is that you actually have 36 data points, but only 16 colors chosen. What occurrs is that the smallest 27 data points are grouped together as the "Others Category." This will become very clear if you just add this line:

this.UltraChart1.PieChart3D.OthersCategoryPercent = 0;

Then you will see how the slices' colors are repeating according to your color scheme. You could just specify 20 more colors so you don't get any repeats, or just let the chart assign colors. I hope this helps and let me know if you need some more help -Paul