### Description

This example illustrates the use vtkChartMatrix, a container that holds a matrix of charts. The example creates a 2 x 2 matrix of plots. The matrix elements are:

(0,0): a vtkPlotPoints
(0,1): a vtkPlotPoints
(1,0): a vtkPlotLine
(1,1): a vtkPlotBar and a vtkPlotPoints

The example also illustrates how to use vtkNamedColors to set the colors for the plots.