[kashperuk]

Когда-то написал вот такой код - пытался учесть выделение "внутри" по вертикали/горизонтали. Вроде работает

void setRangeBorder(BookMark _bookMark,
                    int _lineStyle = 1, // xlContinuous
                    int _lineWeight = 1, // xlContinuous
                    boolean _inside = False, 
                    int _workSheetNumber = 1,
                    container _lines2Draw = [true, true, true, true])
{
    COM         comRange, comBorders, comBorder, comWorkSheet;
    TextBuffer  textBuffer;
    int         fromRow;
    int         toRow;
    ;
    try
    {
        comWorkSheet = this.getWorkSheet(_workSheetNumber);
        comRange     = comWorkSheet.Range(_bookMark);
        if (comRange)
        {
            comBorders = comRange.Borders();
 
            if (conPeek(_lines2Draw, 1))
            {
                comBorder = comBorders.Item(7); // left
                comBorder.Weight(_lineWeight);
                comBorder.LineStyle(_lineStyle);
            }
            if (conPeek(_lines2Draw, 2))
            {
                comBorder = comBorders.Item(8); // top
                comBorder.Weight(_lineWeight);
                comBorder.LineStyle(_lineStyle);
            }
            if (conPeek(_lines2Draw, 3))
            {
                comBorder = comBorders.Item(9); // bottom
                comBorder.Weight(_lineWeight);
                comBorder.LineStyle(_lineStyle);
            }
            if (conPeek(_lines2Draw, 4))
            {
                comBorder = comBorders.Item(10); // right
                comBorder.Weight(_lineWeight);
                comBorder.LineStyle(_lineStyle);
            }
 
            if (_inside)
            {
                textBuffer = new TextBuffer();
                textBuffer.setText(_bookMark);
 
                textBuffer.find('\\:');
                if (textBuffer.matchPos() > 0 && textBuffer.matchLen() == 1)
                {
                    textBuffer.find(@":a+");
                    fromRow = ZCH_ComExcelExportADO::colName2Num(textBuffer.subStr(textBuffer.matchPos(), textBuffer.matchLen()));
 
                    textBuffer.find(@":a+", textBuffer.matchPos() + textBuffer.matchLen());
                    toRow = ZCH_ComExcelExportADO::colName2Num(textBuffer.subStr(textBuffer.matchPos(), textBuffer.matchLen()));

                    if (fromRow < toRow) 
                    {
                        comBorder = comBorders.Item(11); // inside vertical
                        comBorder.Weight(_lineWeight);
                        comBorder.LineStyle(_lineStyle);
                    }
 
                    textBuffer.find(@":d+");
                    fromRow = str2int(textBuffer.subStr(textBuffer.matchPos(), textBuffer.matchLen()));
 
                    textBuffer.find(@":d+", textBuffer.matchPos() + textBuffer.matchLen());
                    toRow = str2int(textBuffer.subStr(textBuffer.matchPos(), textBuffer.matchLen()));

                    if (fromRow < toRow) 
                    {
                        comBorder = comBorders.Item(12); // inside horizontal
                        comBorder.Weight(_lineWeight);
                        comBorder.LineStyle(_lineStyle);
                    }
                }
            }
        }
    }
    catch (exception::Error)
    {
        this.throwError("Ошибка такая-то");
    }
}

Может кому-то пригодится