>I would like to know what are the GUI design standards for windows development. I know for example Win XP use the Font Tahoma as standard.
>
>But what are other standards such as font size, the size of buttons on a form, size of toolbar buttons, height of combo boxes and text boxes.
>
>Is there any documentaion on this?

http://msdn.microsoft.com/library/default.asp?url=/library/en-us/dnwue/html/welcome.asp

Of course, the rules are changing for Windows Vista. <g>

Tamar