On 07/11/2017 06:11 PM, Bob Sneidar via use-livecode wrote:
That is half the battle, but the trick is how to detect I am hovering over a 
datagrid element in the first place.

It's a tooltip.
You shouldn't have to do anything special.
Here's how I set the tooltip of widgets in the PowerTools datagrid:

set the tooltip of image tWidgetNum of me to "someString"

 Mark Wieder

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