protected override void CaretOffsetChanged(object sender, EventArgs e)
        {
            int offset = mEditorControl.ActiveTextAreaControl.Caret.Offset;

            if (offset == startOffset)
            {
                if (CloseWhenCaretAtBeginning)
                {
                    Close();
                }
                return;
            }
            if (offset < startOffset || offset > endOffset)
            {
                Close();
            }
            else
            {
                codeCompletionListView.SelectItemWithStart(mEditorControl.Document.GetText(startOffset, offset - startOffset));
            }
        }