Hi,
Going straight to your questions:
1) You can display more than one series information inside a trackball info. Please, refer to this example to see how this is implemented:
http://demos.telerik.com/silverlight/#ChartView/Financial
2) Yes, datetime is currently implemented as categorical. Have you considered/tried retemplating the candlestick template to include the needed marker?
The release is scheduled for the week of February 15th.
Kind regards,
Vladimir Milev
the Telerik team
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