Tab stop for grid rows (accessibility)

I have a grid where the last column contains a little “+” and “-” graphic icon used to add or remove a row.

It is implemented by setting the column type to “ron” and then adding two HTML tags to the cell (surrounded by CDATA)…

Works great, except the user cannot “tab” into this cell, but must use the mouse to click the “add” button, which presents a usability issue as well as an accessibility issue.

I have tried various combinations of cell types but can’t get the behavior to work right. I want to have two tags within the same column so have not used the “img” excell type.

Please advise how to solve this?

Unfortunately such feature is not available.