Hi Lukas,
Databinding to multiple ChartAreas will be supported with the Q3 2009 release scheduled for November. Currently you can preview the functionality in the public BETA release available for download in your Client.Net account:
XAML:
C#
As for your second question -- export to image is supported only for the chart control and not for the ChartArea.
All the best,
Manuel
the Telerik team