Hi Ian,
I have built a small project based on your code and started debugging the issue. What I have found is that any triggers in the datatemplate will be ignored due to the way RadGrirdView loads the CellTemplate.
This is something we definitely need to improve for our future versions.
Please excuse us for the inconvenience caused!
Meanwhile the only workarround I may offer ( in case you need to keep the things inside the datatemplate) is something like :
Instead of using a trigger , you may use an IValueConverter which checks the value and returns the appropriate color brush.
Since your post has served as a valuable feedback for us revealing an unknown problem in RadGridView I am updating your Telerik points.
Sincerely,
Pavel Pavlov
the Telerik team
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