Need Optgroup in combo of coro type cell

In our existing application, we use combo with coro cell type. We do this using Initialization from XML “For separate cells (pro version only)” method. Below is the link I am referring to
docs.dhtmlx.com/grid__managing_s … ction.html.

We got a change in our application to add categories to that combo. I tried adding optgroup in the following way. But it didn’t work and xml loading failed. Can you please let me know the correct way of achieving this.


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Unfortunately the co/coro excells doesn’t support the option groups.