Select an Entity Graphically
- 
                Click on an inactive collector. An inactive collector DOES NOT have a blue
                    rectangle surrounding it.
                The collector is activated (surrounded by a blue rectangle).
- 
                Hover the mouse cursor over any entity in the graphics window and click.
                All entities that are not of the current type are dimmed.
- With the mouse button clicked/pressed down, when the mouse is hovered over a selectable entity, that entity is highlighted and its label is displayed in a help bubble near the cursor.
- 
                Release the mouse button to select the entity.
                The label of the selected entity is displayed in the field next to the collector.