Hi Priya Iyer,
There are several ways to do that depending on your scenario.
For example, if you would like to get the selected child items every time the selection in a child grid changes you could simply subscribe for SelectionChanged on the root grid. SelectionChanged is a routed event which means that SelectionChanged of the main grid will be raised if selection occurs on any of the child grids.
// subscribe for SelectionChaged
sender, SelectionChangeEventArgs e)
// selection has occurred on a child grid
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