SIP dimension changing

Hi everyone! I'm new in the forum.
I'm actually developping (...mmm...trying to develop...:eek:) an .net application for a Windows CE device (..a lab instrument).
I would like to change the dimension of the SIP, because my instrument has a 640x480 touch screen and users probably will use their fingers to tap SIP buttons (this task is very hard with a 240x80 pixel SIP!).

Is it possible to change the SIP dimensions, or do I have to build my own SIP control?

Thanks in advance to everyone for answers!