While working with GXT2, it was possible to dynamically change a cell's background color using the GridCellRenderer's render method. However, in GXT3, this feature no longer exists. The suggested approach is to utilize a GridViewConfig and override the getColStyle method as mentioned on StackOverflow.
The challenge I face with this solution is that I prefer to directly manipulate the cell's style instead of using CSS classes, especially since the desired background colors are only determined at runtime.
My initial thought was to try something like grid.getView().getCell(rowIndex, colIndex).getStyle().setBackgroundColor(...) within getColStyle, but it seems that the returned cell is always null in this scenario.