GObject +----GInitiallyUnowned +----GtkObject +----GtkWidget +----GtkDrawingArea +----GpwCpu
GpwCpu implements AtkImplementorIface and GtkBuildable.
The CPU status is shown throught subsequent vertical bars with one pixel width. These bars are drawn using three different colors to highlight the difference between user / nice / system CPU usages. The colors are fully modificable throught .gtkrc.