A releasable locking mechanism for attaching a vertical panel to a support member comprises a first component attached to the back of the panel and a second component attached to the top of the support member. The first component includes an engagement tab that projects outward from the rear surface of the panel. The second component includes a tensioned lever arm comprising a locking edge that may be positioned over the engagement tab and hold it in place. An opposing tail of the lever arm may be moved by an individual, which then rotates the locking edge away from engagement tab and allows the panel to lifted away from the support structure.