code: function( giveFocus ) {
  
                  // If we need to give focus, do it before changing states.
                  if ( giveFocus ) {
                      // ....ah yes! It would’ve been incomplete without a crazy workaround for IE :|
                      // The focus is triggered *after* the close has completed - causing it
                      // to open again. So unbind and rebind the event at the next tick.
                      P.$root.off( 'focus.toOpen' ).eq(0).focus()
                      setTimeout( function() {
                          P.$root.on( 'focus.toOpen', handleFocusToOpenEvent )
                      }, 0 )
                  }
  
                  // Remove the “active” class.
                  $ELEMENT.removeClass( CLASSES.active )
                  aria( ELEMENT, 'expanded', false )
  
                  // * A Firefox bug, when `html` has `overflow:hidden`, results in
                  //   killing transitions :(. So remove the “opened” state on the next tick.
                  //   Bug: https://bugzilla.mozilla.org/show_bug.cgi?id=625289
                  setTimeout( function() {
  
                      // Remove the “opened” and “focused” class from the picker root.
                      P.$root.removeClass( CLASSES.opened + ' ' + CLASSES.focused )
                      aria( P.$root[0], 'hidden', true )
  
                  }, 0 )
  
                  // If it’s already closed, do nothing more.
                  if ( !STATE.open ) return P
  
                  // Set it as closed.
                  STATE.open = false
  
                  // Allow the page to scroll.
                  if ( IS_DEFAULT_THEME ) {
                      $html.
                          css( 'overflow', '' ).
                          css( 'padding-right', '-=' + getScrollbarWidth() )
                  }
  
                  // Unbind the document events.
                  $document.off( '.' + STATE.id )
  
                  // Trigger the queued “close” events.
                  return P.trigger( 'close' )
              }
docs: open 
  Close the picker