How to capture visible columns in smart GWT List Grid

Hi,

I wanted to interchange rows and columns in my ListGrid. In my current implementation, i capture the current visible set of rows using getVisibleRows() function to use them for plotting the graph for the date captured in the Grid

If i can interchange rows and columns, how do i get the visible set of columns for capturing the current data rendered in the grid for usage in plotting the graph.

Thanks,
Subbu

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