There are four types of components DISPLACEMENT, VELOCITY,
ACCELERATION, STRESS and STRAIN.
If DISPLACEMENT, VELOCITY, or ACCELERATION is selected, the CURRENT
LAYER is disabled, and the CURRENT COMPONENT is enabled. The user can select any
component or any combination of them.
If STRESS or STRAIN is selected, the CURRENT LAYER is enabled and the CURRENT COMPONENT is disabled. There are three available options: MIDDLE, TOP, and BOTTOM in the CURRENT LAYER.