Basic Controls - Adding, Copying and Deleting Coupler Beam regions

The basic controls for adding, copying, deleting, and selecting Wall Beam Zone Design sets are the icons:

 - Add a new Coupler Beam region

 - Copy a Coupler Beam (automatically add a new pier with the same settings as the copied pier)

 -  deletes the selected Coupler Beam

 - select all Coupler Beams

 - inverts the current selection

 - Lists the currently visible coupler beams