<!-- To enable single click editing of grid cells. -->

            <Style TargetType="{x:Type DataGridCell}">

                <EventSetter Event="PreviewMouseLeftButtonDown" Handler="DataGridCell_PreviewMouseLeftButtonDown"></EventSetter>

            </Style>

        private void DataGridCell_PreviewMouseLeftButtonDown(object sender, MouseButtonEventArgs e)

        {

            DataGridCell cell = sender as DataGridCell;

            if (cell != null && !cell.IsEditing && !cell.IsReadOnly)

            {

                if (!cell.IsFocused)

                {

                    cell.Focus();

                }

                DataGrid dataGrid = Extensions.FindAncestor<DataGrid>(cell);

                if (dataGrid != null)

                {

                    if (dataGrid.SelectionUnit != DataGridSelectionUnit.FullRow)

                    {

                        if (!cell.IsSelected)

                            cell.IsSelected = true;

                    }

                    else

                    {

                        DataGridRow row = Extensions.FindAncestor<DataGridRow>(cell);

                        if (row != null && !row.IsSelected)

                        {

                            row.IsSelected = true;

                        }

                    }

                }

            }

        }