PamSidePanels provide support for additional display units for each
PamControlledUnit displayed in a vertical column to the left of the main
tabbed display.
Side panels should be as small as possible so as not to take space away from
the main tab panel.
Reference to a graphics component that can be added to the view.
This will typically be a JPanel or a JInternalFrame;
The component will be displayed to the side of the main tab control.