The following image demonstrates the GlassPie2DModel.

To take effect, an instance of the GlassPie2DModel class must be assigned to the PieSeries2D.Model property.
System.Object
System.Windows.Threading.DispatcherObject
System.Windows.DependencyObject
System.Windows.Freezable
ChartDependencyObject
DevExpress.Xpf.Charts.PointModel
Pie2DModel
PredefinedPie2DModel
GlassPie2DModel