Hi,
Its probably missing the implicit style for "PropertyItemBase". You can find it in :
-Xceed.Wpf.Toolkit/PropertyGrid/Themes/Aero2.NormalColor.xaml (for Windows 8)
-Xceed.Wpf.Toolkit/PropertyGrid/Themes/Generic.xaml (for other Windows)
Its probably missing the implicit style for "PropertyItemBase". You can find it in :
-Xceed.Wpf.Toolkit/PropertyGrid/Themes/Aero2.NormalColor.xaml (for Windows 8)
-Xceed.Wpf.Toolkit/PropertyGrid/Themes/Generic.xaml (for other Windows)