Hi James,
Please update us more details or a video clip on your requirement. Is your requirement to avoid the navigation over the caption plus/minus on right or left key navigation or do you need to avoid expand / collapse on right and left key?
The following is the sample using your grid settings which demonstrates the way to avoid expand / collapse caption group on Left/Right key navigation.
GGC_Navigation_22Dec06.zipThank you for being patience.
Have a nice day.
Best regards,
Madhan