Add content to a cell of a Telerik RadHeatMap control?

See more:

XAML

Silverlight

Telerik

Hi
I have a telerik heatmap that indicates the RAG status of a number of processes.

I would like to add some commentary text - e.g. minutes overdue or error reason to any amber or red cells.

There doesn't seem to be anything about this in the documentation - is it possible or should I make a fake heatmap with a grid control instead?

Thanks in advance
Duncan