How i can Move between subitems in Listview Multi columns using tab Key

public class MyListView : RadListView
{
    protected override bool ProcessDialogKey(Keys keyData)
    {
        if (keyData == Keys.Tab)
        {
            var view = this.ListViewElement.ViewElement as DetailListViewElement;
            var element = this.ListViewElement;
            int columnIndex = element.Columns.IndexOf(element.CurrentColumn);

            ITraverser<ListViewDetailColumn> colEnumerator = (ITraverser<ListViewDetailColumn>)view.ColumnScroller.Traverser.GetEnumerator();
            colEnumerator.Position = columnIndex;

            if (colEnumerator.MoveNext())
            {
                var isEditing = element.IsEditing;

                element.CurrentColumn = colEnumerator.Current;
                if (isEditing)
                {
                    element.BeginEdit();
                }
                return true;
            }
            else
            {
                ListViewTraverser enumerator = view.Scroller.Traverser.GetEnumerator() as ListViewTraverser;
                enumerator.Position = element.CurrentItem;

                if (enumerator.MoveNext())
                {
                    var isEditing = element.IsEditing;


                    colEnumerator.Reset();
                    colEnumerator.MoveNext();
                    element.CurrentColumn = colEnumerator.Current;
                    element.CurrentItem = enumerator.Current;
                    element.SelectedItem = enumerator.Current;

                    if (isEditing)
                    {
                        element.BeginEdit();
                    }

                    return true;
                }
            }


        }
        if (keyData == (Keys.Tab | Keys.Shift))
        {
            var view = this.ListViewElement.ViewElement as DetailListViewElement;
            var element = this.ListViewElement;
            int columnIndex = element.Columns.IndexOf(element.CurrentColumn);

            ITraverser<ListViewDetailColumn> colEnumerator = (ITraverser<ListViewDetailColumn>)view.ColumnScroller.Traverser.GetEnumerator();
            colEnumerator.Position = columnIndex;

            if (colEnumerator.MovePrevious())
            {
                var isEditing = element.IsEditing;

                element.CurrentColumn = colEnumerator.Current;

                if (isEditing)
                {
                    element.BeginEdit();
                }
                return true;
            }
            else
            {
                ListViewTraverser enumerator = view.Scroller.Traverser.GetEnumerator() as ListViewTraverser;
                enumerator.Position = element.CurrentItem;

                if (enumerator.MovePrevious())
                {
                    var isEditing = element.IsEditing;

                    colEnumerator.MoveToEnd();
                    element.CurrentColumn = colEnumerator.Current;
                    element.CurrentItem = enumerator.Current;
                    element.SelectedItem = enumerator.Current;

                    if (isEditing)
                    {
                        element.BeginEdit();
                    }

                    return true;
                }
            }
        }
        return base.ProcessDialogKey(keyData);
    }
}