2011

Reassigning an object to a different layer is useful if you create an object on
the wrong layer or decide to change your layer organization. Unless the color,
linetype, or other properties of the object have been set explicitly, an object
that you reassign to a different layer will acquire the properties of that layer.
You can change layer properties in the Layer Properties Manager and in the
Layer control on the Layers toolbar. Click the icons to change settings. Layer
names and colors can be changed only in the Layer Properties Manager, not
the Layer control.
Undo Changes to Layer Settings
You can use Layer Previous to undo changes you make to layer settings. For
example, if you freeze several layers and change some of the geometry in a
drawing, and then want to thaw the frozen layers, you can do this with a
single command without affecting the geometry changes. In another example,
if you changed the color and linetype of several layers but later decide you
prefer the old properties, you can use Layer Previous to undo the changes and
restore the original layer settings.
When you use Layer Previous, it undoes the most recent change or set of
changes made using either the Layer control or the Layer Properties Manager.
Every change you make to layer settings is tracked and can be undone with
Layer Previous. You can use LAYERPMODE to suspend layer property tracking
when you don't need it, such as when you run large scripts. There is a modest
performance gain in turning off Layer Previous tracking.
Layer Previous does not undo the following changes:
■ Renamed layers. If you rename a layer and change its properties, Layer
Previous restores the original properties but not the original layer name.
■ Deleted layers. If you delete or purge a layer, using Layer Previous does
not restore it.
■ Added layers. If you add a new layer to a drawing, using Layer Previous
does not remove it.
Changes in the Layer Properties Manager can be grouped by enabling Combine
Layer Property Change option in User Preferences tab in the Options dialog
box. Layer creation and deletion will be tracked in the Undo list as unique
items.
To change the layer of one or more objects
1 Select the objects whose layer you want to change.
Change Layer Settings and Layer Properties | 483