code: function( id ) {
  			var tab = this._.tabs[ id ] && this._.tabs[ id ][ 0 ];
  			if ( !tab )
  				return;
  			tab.show();
  			this._.pageCount++;
  			this.updateStyle();
  		}
docs: Unhides a page's tab.
  
  dialog.showPage( 'tab_2' );
  
  @param {String} id The page's Id.