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You can also remove objects from the current selection set by holding down
Shift and selecting them again, or by holding down Shift and then clicking
and dragging window or crossing selections. You can add and remove objects
repeatedly from the selection set.
Prevent Objects from Being Selected
You can prevent objects on specified layers from being selected and modified
by locking those layers.
Typically, you lock layers to prevent accidental editing of particular objects.
Other operations are still possible when a layer is locked. For example, you
can make a locked layer current, and you can add objects to it. You can also
use inquiry commands (such as LIST), use object snaps to specify points on
objects on locked layers, and change the draw order of objects on locked layers.
To help you differentiate between locked and unlocked layers, you can do the
following:
Hover over an object to see whether a lock icon is displayed
Dim the objects on locked layers
NOTE Grips are not displayed on objects that are on locked layers.
Select Objects by Properties
Use object properties or object types to include objects in a selection set, or
to exclude them.
To quickly define a selection set based on specified filtering criteria, use
Select Similar (SELECTSIMILAR) to select similar objects of the same type
based on specified matching properties
With object selection filters, to filter your selection set based on color, linetype,
or lineweight, consider whether these properties are set to BYLAYER for any
objects in your drawing. For example, an object may appear red because its
color is set to BYLAYER and the layer color is red.
By default, objects of the same type are considered similar if they are on the
same layer, and, for blocks and other referenced objects, have the same name.
Subobjects are only considered at the object level. For example, when a mesh
198 | Chapter 6 Create and Modify Objects
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