The selected behavior list at the top of the material editor window displays the behaviors and suboptions that comprise the current material; the list is updated as you add and delete behaviors. The following figure shows how the list would look if an elastic-plastic material complete with stress-based failure limits were defined:
Using the selected behavior list, you can add, delete, or change materials as follows:
Adding material behaviors
Select the behaviors needed to define your material from the menus just below the selected behavior list. When you select a behavior, its name appears in the list, and the parameters and data associated with the behavior appear in the data area in the bottom portion of the editor window. Suboptions appear beneath the corresponding primary behavior and are indented to indicate their subordinate position.
Deleting material behaviors
Within the selected behavior list, click the behavior or suboption you want to delete; then click the 
icon located near the lower right corner of the behavior list. This procedure removes the behavior from both the behaviors list and the material definition. If you delete a behavior that has suboptions shown beneath it in the list, the suboptions are also deleted.
Changing material parameters or data
Within the selected behavior list, click the behavior whose data you want to change. When the parameters and data associated with the behavior appear in the data area in the bottom portion of the window, make the desired changes.
