### 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.
