code: function( isDockable ) {
  		if ( this.dockButton && this.parent._header && this.parent._header.dock ) {
  			this.dockButton.element.toggle( !!isDockable );
  			return true;
  		}
  		return false;
  	}
docs: Programmatically set ability to dock.
  
  @package private
  @param {Boolean} isDockable Whether to enable/disable ability to dock.
  
  @returns {Boolean} Whether the action was successful