Would like to know how to i customise/change the colour for each slices in the donut series. 

The legend to also follow the customised color

This is my current code.

When user tap on a slice, the colour got changed. how do i prevent this?

Also, can i also check how do i show the tooltip when user tap on a slice.

Hello Benjamin,

Thank you for sending the snippet you're using. 

Creating a ChartPalette is the proper way to customize the slices' colors  - you just need to add a few more entries to cover all the data items.  The legend follows the same palette set to the Chart.

As to the selection of slices -  you can prevent it by setting AllowSelect property of the DonutSeries to False.

I have attached a sample XAML page based on the provided snippet to show you how this would work - please download it and give it a try.

Lastly, about the tootips - currently the ToolTipBehavior does not work properly for PieChart, we have this logged as a bug report in our feedback portal, you can track its status at the link below:

https://feedback.telerik.com/xamarin/1366403-piechart-tooltip-behavior-is-not-working-properly

Let me know if I can help with anything else.

Regards,
Yana
Progress Telerik

Hi Yana

Thanks for your reply. In the meantime, is there any workaround for the tooltip issue? as it is a very important function for my app

Hi Benjamin,

We've previously researched this issue, so I can immediately reply - there isn't a feasible workaround I could suggest at the moment.  It's quite a complicated issue in the native Chart controls and we're having it in mind, still, I cannot commit to any timeframe for providing a fix. We will update the feedback item as soon as there is any progress on it.

Regards,
Yana
Progress Telerik