public override void OnApplyTemplate()
        {
            base.OnApplyTemplate();

            this.PART_GridRoot              = base.GetTemplateChild("PART_GridRoot")              as Grid;
            this.PART_ButtonSearchFirst     = base.GetTemplateChild("PART_ButtonSearchFirst")     as Button;
            this.PART_ButtonSearchPrevious  = base.GetTemplateChild("PART_ButtonSearchPrevious")  as Button;
            this.PART_ButtonSearchNext      = base.GetTemplateChild("PART_ButtonSearchNext")      as Button;
            this.PART_ButtonSearchLast      = base.GetTemplateChild("PART_ButtonSearchLast")      as Button;
            this.PART_ViewboxPathSearch     = base.GetTemplateChild("PART_ViewboxPathSearch")     as Viewbox;
            this.PART_DelayTextBox          = base.GetTemplateChild("PART_DelayTextBox")          as DelayTextBox;
            this.PART_CheckBoxSearchContext = base.GetTemplateChild("PART_CheckBoxSearchContext") as CheckBox;

            this.PART_DelayTextBox.DataType = typeof(string);
            dataGrid = Helpers.FindVisualParent<ExpandGrid>(this);

            this.PART_DelayTextBox.TextChanged += dataGrid.OnTextChanged;
        }

        public void OnTextChanged(object sender, TextChangedEventArgs e)
        {
            DelayTextBox delayTextBox = e.OriginalSource as DelayTextBox;
            int rowIndex = _currentRowIndex;
            bool findItem = false;
            bool searchContext = (Helpers.FindVisualParent<SearchControl>(delayTextBox) as SearchControl).PART_CheckBox.IsChecked.Value;
            string searchText = delayTextBox.Text;

            if (this.Items.Count == 0 || string.IsNullOrEmpty(searchText))
                return;

            if (rowIndex <= -1)
                rowIndex = 0;

            if (_currentColumn == null)
                this.CurrentColumn = this.Columns[0];

            for (int i = rowIndex; i < this.Items.Count; i++)
            {
                if (searchContext)
                    findItem = (this.Items[i] as DataRowView)[_currentColumn.SortMemberPath].ToString().ToLower().Contains(searchText.ToLower());
                else
                    findItem = (this.Items[i] as DataRowView)[_currentColumn.SortMemberPath].ToString().ToLower().StartsWith(searchText.ToLower());

                if (findItem)
                {
                    this.CurrentCell = new DataGridCellInfo(this.Items[i], _currentColumn);
                    _currentCell.Focus();
                    this.ScrollIntoView(this.Items[i], _currentColumn);

                    return;
                }
            }
        }