How to get the values ​​of the selected line in Xuni.FlexGrid?

Please, help.
How to get the values ​​of the selected line in Xuni.FlexGrid?

For eample:
string ID = "";
FlexGrid flexGrid = FindViewById<FlexGrid>(Resource.Id.flexGrid1);
flexGrid.SelectionMode = GridSelectionMode.Row;
ID = flexGrid.SelectedRow["ID"].ToString();