public void ExtendSelection(NSTextView view, NSEvent evt)
        {
            int index = DoMouseEventToIndex(view, evt);

            NSRange range = view.selectedRange();
            if (range.length == 0 && index < view.string_().length() && view.string_()[index] == '\n')
            {
                // don't extend the selection if the user clicked off to the right side of a line
            }
            else if (index >= view.string_().length())
            {
                // don't extend the selection if the user clicked below the last line of text
                view.setSelectedRange(NSRange.Empty);
            }
            else
            {
                // Extend the selection so that it contains the entire word the user right-clicked on.
                if (range.length == 0 || !range.Intersects(index))
                {
                    range = new NSRange(index, 1);
                    range = view.selectionRangeForProposedRange_granularity(range, Enums.NSSelectByWord);
                    view.setSelectedRange(range);
                }
            }
        }