Wpf/SL charts - Pie tooltip

I want to set a toolTip on each of the data Points of 开发者_JS百科the pie charts. I know how to do that, but as you can see in the attached picture, the toolTips look different according to the data points directions.

Someone has an idea how can I do that ?

---

If you're using the WPF/Silverlight toolkit charts, see Bea Stollnitz's posts on that subject:

http://bea.stollnitz.com/blog/?p=353

http://bea.stollnitz.com/blog/?p=438

http://bea.stollnitz.com/blog/?p=363

Her posts are very well-written - you should be able to find what you need there.

---

If you are looking for more advanced charts then you should give Telerik a try. Here is a demo page with several chart samples (that can include ToolTips).