DevExtreme jQuery/JS - Column and Row Indexes
The following indexes can be used in methods and callback functions:
- Initial Column Index (or simply Column Index) 
 Equals the column's index in the columns array.
- Visible Column Index 
 Depends on the column's current location in the TreeList and changes dynamically when columns are reordered. - Do not confuse the visible column index with the index specified using the column.visibleIndex option. The latter is used in column reordering. 
- Row Index 
 Starts from 0 and increases by 1 per row. 
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