Thanks for the response,
I know the origin of the issue, I was just wondering if there was a way to change the behaviour of the tooltip/link generators.
I need the graphs to be displayed as stacked areas, a stacked line chart would be misleading in this case
I defined the categories in my producer class in the opposite order, but now, instead of just showing the link for the red category it now just displays the tooltip for the green category. Even on the sections where you cannot see the green category, which is even more strange behaviour.
On further inspection...
The categories are reversed but as the red category must be drawn first (otherwise it draws on top of the other categories) it doesn't matter what order the categories are defined as the red category is still treated as the first by the tooltip and link generators. It appears as though the green tooltip is being shown as it retrieves the series name from the definition not the dataset. If I use the dataset passed to the tooltip generator to print out the series name it, again, only shows the red category.
I'm beginning to think that this is something that is impossible to achieve which is disappointing. If there is anything else that you could suggest it would be greatly appreciated.