Selecting Within the Viewer

You can use standard selection behavior within viewers.

Action	Behavior
Click	Selects the first object below the mouse.
Drag	Selects all objects within or touched by the marquee.
Shift+click	Selects an object if it is not selected, deselects it if it is.
Shift+drag	Selects any object within the marquee that is not selected, deselects it if it is.
Ctrl+click	Deselects the first object below the mouse.
Ctrl+drag	Deselects everything within the marquee.