How do I delete a brick material?

Geometry Elements- Dielectric Bricks

To delete a brick material, do the following:

1.   Select Circuit => Brick Materials from the project editor main menu.

2.   In the Brick Materials dialog box which appears, click on the Brick Material you wish to delete to select it.

3.   Click on the Remove button to the right of the material list. This deletes the brick material. Any polygons that used this brick material are converted to the default dielectric material, Air.

4.   Click on the OK button to close the dialog box.