Autodesk AUTOCAD LT 2010 Tips And Tricks Manual page 6

Block References
Blocks have been an important tool in
AutoCAD LT for many versions, and
they just keep getting better. New
commands in AutoCAD LT 2010 make
working with dynamic blocks and block
attributes easier and more intuitive.
Test Block
Inside the Block Editor, a new Test Block
tool enables you to see the effect your
changes will have before you apply
those changes to every instance of the
block. It's perfect for testing dynamic
parameters and actions. When you close
the Test Block window, you're returned
to the Block Editor.
The Test Block environment can
be identified by its title bar and by its
contextual ribbon panel, which contains
a "Close Test Block Window" tool.
Action Bars
Actions in dynamic blocks are now
automatically grouped into bars, making
it easy to see which parameter they're
associated with. Selecting an action high-
lights the related parameter, all affected
objects, and the selection window (for
stretch actions). Right-clicking an action
brings up a menu with options to delete
or rename the action, to modify its selec-
tion set, or to hide the action bars.
If you want to turn on the action
bars again, you can either close and
re-open the Block Editor, or use the com-
mand BACTIONBAR.
A new icon enables you to easily
identify which parameters have their
"Chain Action" property turned on.
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