Using Dynamic Blocks and Tables - AutoCAD 2011 and AutoCAD LT 2011: No Experience Required - page 469

From the menu bar, choose View Menu ➢ Regen All or enter REA ↵ .
The area updates to show the true value for the associated polyline
(see Figure 9.38).
FiGuRE 9.36 Select part of the front deck with the STRETCH command.
FiGuRE 9.37 The front deck after stretching it to the right