How to Access Corresponding Parent Table’s Row from the Child

Get the table’s current element. Then cast this element to GridNestedTable. You can now access the parent table for the current element. This is a recursive process.

Element el = this.gridGroupingControl1.TableControl.Table.CurrentElement;
if(el != null)
{
    if(el is GridRecord)
    {
        Console.WriteLine("no parent row...");
    }

//Checks for a child table.
    else if(el is GridNestedTable)
    {
        GridNestedTable gridNestedTable = el as GridNestedTable;
        GridNestedTable gridNestedTable1 = gridNestedTable;
        while(gridNestedTable1 != null && gridNestedTable1.ChildTable != null)
        {
             gridNestedTable = gridNestedTable1;

//Gets the handle for parent table.
             gridNestedTable1 = gridNestedTable.ChildTable.ParentTable.CurrentElement as GridNestedTable;
        }

//Retrieves the corresponding parent table's record.
        DataRowView drv = gridNestedTable.ParentRecord.GetData() as DataRowView;

//Shows column 2.
    Console.WriteLine(drv[1].ToString()); 
    }
}
Dim el As Element = Me.GridGroupingControl1.TableControl.Table.CurrentElement
If Not (el Is Nothing) Then
If TypeOf el Is GridRecord Then
Console.WriteLine("no parent row...")
Else

'Checks for a child table.
If TypeOf el Is GridNestedTable Then
Dim gridNestedTable As GridNestedTable = el
Dim gridNestedTable1 As GridNestedTable
If TypeOf gridNestedTable Is GridNestedTable Then
gridNestedTable1 = gridNestedTable
Else
gridNestedTable1 = Nothing
End If
While Not (gridNestedTable1 Is Nothing) AndAlso Not (gridNestedTable1.ChildTable Is Nothing)
gridNestedTable = gridNestedTable1
If TypeOf gridNestedTable.ChildTable.ParentTable.CurrentElement Is GridNestedTable Then

'Gets the handle for parent table.
gridNestedTable1 = gridNestedTable.ChildTable.ParentTable.CurrentElement
Else
gridNestedTable1 = Nothing
End If
End While

'Retrieves the corresponding parent table's record.
Dim drv As DataRowView = gridNestedTable.ParentRecord.GetData()

'Shows column 2.
Console.WriteLine(drv(1).ToString()) 
End If
End If
End If