public void ChangeSelection(HighlightedSelectionAction selectedAction)
        {
            int selectedIndex = listBox1.SelectedIndex;

            switch (selectedAction)
            {
                case HighlightedSelectionAction.Up:
                    if (selectedIndex <= 0)
                        listBox1.SelectedIndex = (listBox1.Items.Count - 1);
                    else
                        listBox1.SelectedIndex = selectedIndex - 1;

                    listBox1.ScrollIntoView(listBox1.SelectedItem);
                    break;

                case HighlightedSelectionAction.Down:
                    if (selectedIndex == (listBox1.Items.Count - 1))
                        listBox1.SelectedIndex = 0;
                    else
                        listBox1.SelectedIndex = selectedIndex + 1;

                    listBox1.ScrollIntoView(listBox1.SelectedItem);
                    break;
            }
        }
 private void ChangeIntellisenseSelectedItem(HighlightedSelectionAction selectedAction)
 {
     _intellisenseWindow.ChangeSelection(selectedAction);
 }