adsk-forge-LevelSectionPanel-step10

unload() {
    if ( this.panel ) {
        this.panel.uninitialize();
        delete this.panel;
        this.panel = null;
    }

    if ( this.subToolbar ) {
        this.viewer.toolbar.removeControl( this.subToolbar );
        delete this.subToolbar;
        this.subToolbar = null;
    }

    return true;
}