Screen Display Problem in Windows 7 OS

Hello Gurus,

    I have a scenario for creating sub screen area in sales order 'Additional data B' tab.I created screen and its working fine.But problem is if open sales order in Windows XP system its displaying screen properly,but if i open same thing in windows 7 screen is not showing screen completely. Sub screen is displaying only 70%. I thought it is issue on SAP GUI side.But am not able to find a solution.Please help to solve this issue.

Thanks,

Chittoor.