Copyright Goodheart-Willcox Co., Inc. Chapter 8 Creating and Working with Solid Model Features 175 Picking the button sets the value of the SOLIDHIST system variable Figure 8-2. The Solid History button, located in the Primitive panel of the Solid tab on the ribbon, is used to control the SOLIDHIST system variable setting. This button has a white background when the SOLIDHIST system variable is set to 0 (the default value). If picked, the button has a blue background. A B C Move grip tool Figure 8-3. A—The object appears in its current state with the Show History property turned off. The History property was initially set to Record before subtracting two solid primitives. B—The Show History property is set to Yes and the display of isolines has been turned on. C—When the sphere is selected while pressing the [Ctrl] key, grips are displayed to indicate the sphere primitive subobject is selected. The move grip tool can be used to edit the original sphere primitive.