+The actual information about how to display the dialog and the colors in the
+dialog's 'registers' are contained in a wx.ColourData instance that is created by
+the dialog at init time. Before displaying the dialog, you may alter these settings
+to suit your needs. In the example, we set the dialog up to show the extended colour
+data selection pane. Otherwise, only the more compact and less extensive colour
+dialog is shown. You may also preset the colour as well as other items.