VB.NET datagrid - detect combo box selection and select same value in different column
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I have a datagrid with combo boxes. Now I want to achieve that if on selects value x in column 0 row 0 then then combo box value y in colum 1 row 0 is set to the same value like x automatically.

I tried 

     Private Sub dataGridView1_CellValidating(ByVal sender As Object, ByVal e As DataGridViewCellValidatingEventArgs) Handles Sched_Grid.CellValidating
        If Sched_Grid.CurrentCell.ColumnIndex = 0 Then
            Sched_Grid(1, Sched_Grid.CurrentCell.RowIndex).Value = Sched_Grid(0, Sched_Grid.CurrentCell.RowIndex).Value
        End If
    End Sub

However, it doesnt work immediately. I have to first selected a value x(0,0), then click a different cell(5,5 or something else) and then click back into x(0,0) cell so that y(1,0) gets set to x(0,0).

How can this be solved?