Working with the Frame Generator - Autodesk Inventor 2010: No Experience Required - page 244

FIGURE 5.32 The quick way to access 3D grips
FIGURE 5.33 Activating a 3D grip makes handles accessible.
Controlling 3D Grips
While a 3D grip is being edited, you can access different options by right-clicking
to display this menu (or one that is similar).