Changing scrollbar size in Internet explorer 6 by using Windows CE 6.0

Question

Hi, I need to change the scroll bar's size of Internet Explorer 6 in Windows CE application. by referring to http://msdn.microsoft.com/en-us/library/aa452005.aspx , I'm only able to change the scroll bar slider's size(by changing SBSizeV and SBSizeH value) but not the arrow button's size. Is there any way that I could change the size? Thank you.