updating row indices when a middle row is deleted

I am using the add / delete row grid component. This is the problem I am facing.
Suppose there are four rows in the grid. If I delete the row no 2, the indices of row no 3 and 4 should get shifted to 2 and 3 respectively. So that the next row will be get added with index 4.
Please help me to figure this out.

The row indices are permanent and do not change when you add/remove rows or sort the grid. Row indices refer to the data in the data source and not row display position.

http://www.activewidgets.com/aw.ui.grid/row-indices.html