- Types of GControls (Displays):
  - `PANEL` (Widget panel)
      Used to hold a graphical primitive in the controls section.

      A `PLOT` displayed in a `PANEL`

    `PIPEMON` (Pipe monitor)
      Used for debugging pipes or simple status displays.
    `QUERY` (Query control object)
      Used for debug or control of an object.
    `TEXT` (Multi-line text display object)
    `STEXT` (Multi-line styled text (e.g. HTML) display object).