Hi Petr,
Batch editing is based fully on client-side and it is essentially different than other server-side modes:
http://docs.telerik.com/devtools/aspnet-ajax/controls/grid/rows/accessing-cells-and-rows#accessing-controls-in-batch-edit-mode
I'm afraid this requirement is not supported with Batch editing.
You can use InPlace edit mode instead, which resembles Batch editing:
https://demos.telerik.com/aspnet-ajax/dropdowntree/examples/applicationscenarios/dropdowntreeingrid/defaultcs.aspx?product=grid
https://docs.telerik.com/devtools/aspnet-ajax/controls/grid/data-editing/edit-mode/in-place
You can also add AJAX to simulate behavior similar to client-side performance.
For cascading comboboxes editing implementation, you can also check the samples provided here:
https://www.telerik.com/forums/radcombobox-cascading-inside-radgrid#GxsIQqyyPkqj1Za-mNbalg
I hope this will prove helpful.
Regards,
Eyup
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