Creating 3D Geometry - AutoCAD 2011 and AutoCAD LT 2011: No Experience Required - page 863

FiGuRE 16.36 Rotating the window 90° counterclockwise
2. Select the window frame, right-click, and choose Properties; and
then, in the Solid History rollout, choose Yes for the Show History
option. See Figure 16.37.
FiGuRE 16.37 In the Properties palette, set the Show History property
to Yes.
An outline of the box, used to subtract the volume for the opening,
appears as shown in Figure 16.38.
3. Hold the Ctrl key down, and click the window frame to select it and
expose the grips.