F4.8} Selection

   Objects, Bodies, Regions and/or Zones can be selected either:

   - From the Object and/or Properties list boxes.
     Holding [Ctrl] toggles the selection, and holding [Shift]
     selects a range of items

   - Graphically using the action [s]  with the
     <Left-Mouse> button
     * [Ctrl] + left-mouse-button toggles the selection (select/unselect);
     * Area selection: Click on the background and drag the mouse to draw a
       rectangle area. Everything inside the area will be selected.
       Also holding [Ctrl] pressed will toggle the selection.

   Notes:
   - The Selected items (from the filtered ones) are visible when the
      check box on the object listbox is pressed

   - OBJECTS:
      * highlighted in magenta
      * can be graphically modified

   - BODIES: The selected bodies are:
      * outlined in magenta
      * yellow dots appear on their vertices and intersection with
        other bodies. They can be used as snapping points
      * the action handlers appear on the last selected body,
        permitting to move/rotate/resize the body (see F4.10)
      * highlighted also into the object list in the left bar
      * Their common properties & attributes will be displayed on the list boxes.

   - REGIONS:
      * The selected regions are shaded with a darker or lighter color;
      * Clicking on a point of overlap of two or more zones ALL
        overlapping zones will be selected

   - ZONES:
      * The select zones are shaded with a hash pattern;
      * To select a zone first you have to select ONE REGION;
      * Then click on point that belongs to the zone;
      * Or select the zone from the Properties Listbox;

   - [ESCape] cancels the selection


   Selection Freezing
   ******************

   When repeated operations have to be performed with involving some
   bodies or regions, the user can LOCK the selection of this
   bodies/regions with:
      - Menu -> Tools -> Selection -> Freeze
      - Go to the Attributes and click on Lock [X] check box
      - or Right-click -> Selection -> Freeze
      - or Shortcut [l]
      - or Icon  on the ribbon

   WARNING: is very important to remember to UNLOCK at the end of
   the operation
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