Thank you for your questions.
1) Please use the CellFormatting
event. There is an example in our demo application - RadGridView -->Group Summaries. Use e.CellElement.ColumnIndex
the column index.
2) We currently do not support Grand Total
for the Sub Totals,
but it is an interesting feature that we can consider adding to our RadGridView
in one of our future releases.
Do not hesitate to write me back if you have further questions.
All the best,
the Telerik team
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