Themes and VisualStyles
Themes and VisualStyles are closely related and on occasions can clash.
The theme settings do not override Visual Styles settings in an application. For example if a panel appears green because its VisualStyle specifies a NormBackColor of green, the panel will continue to appear green even in a 2007Blue themed application.
For cases where conflicts exist, you need to evaluate where the VisualStyle items should be reset in order to achieve the look you want.