Screenshots: Windows XP Themes
The xpnative theme engine uses the Microsoft XP themeing API to draw the theme elements. This ensures that we get exactly the same look as all other applications on XP. If themeing is disabled (by selecting Windows Classic in the Appearance dialog) then the theme drops back to using the winnative themeing engine which uses the GDI calls that Windows used previously.
Click on any of the pictures to see a full size version: