I made everything work good but in sub grid when I try to delete some record it displays error to get better understanding please refer to image in provided URL:
The first column of grid must have unique alphanumeric content (usually a PK).
This is required for proper display as well as update & delete operations of particular row.
In your subgrid, it is image <img> that's why unable to delete.
You can hide the first column by $col["hidden"] = true; but it must be defined.
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