Drop down in Excel 2010 using jxl Parser

I am jusing jxl API to read and write excel files using Java. I successfully created a drop down box using the jxl parser. The created excel format is .xls. When i opened with Excel 2007 the drop down is in place but when i opened it using Excel2010 i am not getting the drop down or it is misplaced.

Please suggest me a solution.

Thanks i开发者_开发百科n advance.