WPF Datagrid focus on new row

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C#

I have datagrid with addnew button and delete button columns.
when i click on add new button the focus should come on the new row.
What should i do?


Now i have added two events

private void DataGrid_CurrentCellChanged(object sender, EventArgs e)
        {
            DataGrid.BeginEdit();
        }

private void DataGrid_PreparingCellForEdit(object sender, DataGridPreparingCellForEditEventArgs e)
        {
                UIElement inputElement;
                inputElement = DataGridHelper.GetVisualChild<TextBox>(e.EditingElement);
                if (inputElement != null)
                {
                    Keyboard.Focus(inputElement);
                }
        }

But Now i have to click twice the AddNewButton for a new row to come or for deleting i have click twice the delete button.

To Solve this what should i do?
Please help me!